Police cars following three teenagers on a moped were told repeatedly to pull back before it crashed and one of the teenagers died, an inquest heard.
Tyereece Johnson, 16, died on 17 July 2017 after being thrown from the moped, which was believed to have been involved in an attempted robbery.
Inner West London Coroner’s Court also heard a pursuit across south London had not been authorised.
A report by the police watchdog will be released at the inquest’s close.
The trio were being tracked by a police helicopter feeding information on their location to cars on the ground in the early hours of 16 July, the inquest heard.
The court was told that on at least two occasions, a female officer could be heard saying over the radio: “Can you try not to follow the vehicle too closely please?”
PC Lee Hunt, a tactical pursuit adviser on the night of the crash, told the court he did not authorise a pursuit, because the trio were not wearing helmets and due to the risk to other road users and pedestrians.
He advised that police cars attempted to position themselves ahead of the moped and lay down a stinger device to bring it to a halt.
He also told the inquest he was unaware there were two police cars following the moped.
Footage presented to the inquest showed the moped and its hooded riders weaving a convoluted route from Clapham Common to Wimbledon in south London, before crashing into the back of the police car and being flung in different directions.
The inquest heard that Tyereece died of his injuries in hospital the following day.
Tyereece’s mother Samantha Cohen described the teenager as a “brilliant” footballer and Chelsea fan, who was scouted by the Royal Ballet, according to a statement read by coroner Dr Shirley Radcliffe.
It added Ms Cohen and her son moved to Croydon from north London after she became concerned he had “fallen into the wrong crowd”.
The inquest is scheduled to last for eight days.
Arsenal will clinch their first Women’s Super League title since 2012 if they beat Brighton on Sunday.
The Gunners – English women’s football’s most decorated club despite that wait – are four points above Manchester City with two games to go.
“We didn’t have the consistency in recent years. This year we’ve had the full package,” defender Leah Williamson told BBC Sport.
A crowd of around 3,000 are set to watch the match at the Amex Stadium.
Williamson said the Gunners “desperately” want to add to their 14 English league crowns, which includes two WSL titles and 12 Women’s Premier League trophies.
“It would be great if we could win it because this football club dominated for so many years,” the 22-year-old said.
“We haven’t been close enough for the past few years. Everybody is relishing the opportunity.
“It’s definitely not haunting us. It’s very exciting and we’ll see what we can do.”
Arsenal’s long wait for silverware
Williamson, who has been with Arsenal since the age of nine, recalls watching on in awe as an academy player as the London club won nine consecutive league titles between 2004 and 2012.
“I watched all those [idols], Rachel Yankey, Faye White, Alex Scott, Kelly Smith, Jayne Ludlow – I could go on and on – lift the trophy so easily. That’s what it looked like for so many years,” said Williamson.
“But now I realise it was true dominance.
“It’s sad that it’s taken this long for us to even be in the position where we might take home that trophy, but hopefully we can do it for Arsenal.”
The Gunners narrowly lost February’s Women’s League Cup final against Man City on penalties, but Williamson says they never felt sorry for themselves.
Rather, that defeat has helped motivate the squad.
“It’s not a sad story. That wasn’t good enough for what we want to achieve,” the England international continued.
“We’re a football club that needs to be winning trophies to meet our standards, so to miss out on that piece of silverware and be so close, it’s not good enough.
“We need that trophy in our cabinet if we want to have a successful season. Once that [the League Cup] was over and that wasn’t coming home, we needed to make sure the league was our priority to bring home silverware this year.”
A bumper crowd at Brighton
Should Arsenal slip up against Brighton, second-placed Manchester City – who face Arsenal on the final day of the season – could capitalise. Nick Cushing’s City side face relegated Yeovil later in the day.
Sunday’s fixture is also a significant one for the Seagulls, playing at the home of their men’s side.
BBC Sport understands the hosts could see a new club-record crowd for a women’s game on Sunday.
Brighton, who were promoted to the WSL last summer, have already secured their safety in the division, but manager Hope Powell still wants to see improvements.
“It would be great if we could try and upset them [Arsenal] or at least make it as difficult as possible,” former England boss Powell told BBC Sussex.
“It’s more about performances now. We’re looking for players to perform at this level.
“Arsenal will be a really big test of us, just to see where we are. We want to strive to be the best and Arsenal are the best.
“So we need to understand how much further away we are from them.”
A climate protest that has disrupted parts of London for nine days is to end on Thursday, organisers say.
Police cleared Extinction Rebellion’s final road block in Marble Arch earlier and arrested 22 people, bringing the total to 1,088 since protests began.
Specialist equipment has been deployed in Parliament Square to remove protesters camping in trees.
Makeshift camps at Oxford Circus and Waterloo Bridge were removed earlier in the week.
One protester told the BBC “This is our last stand”.
Organisers said a closing ceremony would be held at 18:00 BST on Thursday at Speaker’s Corner, Hyde Park.
“We will leave the physical locations but a space for truth-telling has been opened up in the world,” they said in a statement.
“We know we have disrupted your lives. We do not do this lightly. We only do this because this is an emergency.”
Mayor of London Sadiq Khan said he welcomed the decision to cease the protests, which had been a “huge challenge for our over-stretched and under-resourced Metropolitan Police”.
So far 69 people have been charged in connection with the protest, the Met Police said.
Police have extended restrictions at the Marble Arch site, preventing protesters congregating on the road, until Saturday afternoon.
A senior Scotland Yard officer has warned that officers will require new powers to deal with demonstrations on a similar scale in the future.
Giving evidence to the parliamentary Human Rights Committee, Commander Adrian Usher, head of the Metropolitan Police’s protection command, said it should not be enough for a protest to be “peaceful” to be considered lawful.
“We will conduct a sober review of our tactics against recent protests, but I think it is likely to say the legislation associated with policing protest is quite dated and that policing and protest has moved on and that legislation should follow suit,” he said.
Earlier, Extinction Rebellion Youth handed a letter addressed to MPs, to Shadow Home Secretary Diane Abbott.
In response, Ms Abbott said MPs needed to come together to host a “broad conversation” on bringing the country’s greenhouse gas emissions down.
Campaigners have issued three core demands to the government: to “tell the truth about climate change”; to reduce carbon emissions to zero by 2025; and to create a citizens’ assembly to oversee progress.
Elliott Cuciurean, 20, believed to be the first climate activist successfully prosecuted over the fresh wave of protests, was spared a fine at a court hearing on Tuesday.
More actions are expected in the future.
Extinction Rebellion protesters took over part of the Natural History Museum as the climate change protest entered its second week.
About 100 people lay down under the skeleton of the blue whale.
It comes as more than 1,000 people have been arrested since the protests began in central London a week ago.
The climate change group are now based in Marble Arch, after police moved protesters from Oxford Street, Waterloo Bridge and Parliament Square.
Extinction Rebellion hopes the protest at the museum, which they are calling a “die-in”, will raise awareness of what they call the “sixth mass extinction”.
Most of the protesters finished their lie-down protest after about half an hour.
Some protesters, wearing red face paint, veils and robes, remained to give a performance to classical music on the steps underneath the whale skeleton.
On Sunday, teenage activist Greta Thunberg told the rally in Marble Arch that they were “making a difference”.
Mayor of London Sadiq Khan said the protest was taking “a real toll” on London’s police and businesses.
“I’m extremely concerned about the impact the protests are having on our ability to tackle issues like violent crime if they continue any longer,” he said.
About 9,000 police officers have been responding to the protest since it began a week ago on 15 April.
A total of 1,065 people have been arrested and 53 have been charged for various offences including breach of Section 14 Notice of the Public Order Act 1986, obstructing a highway and obstructing police.
Olympic gold medallist Etienne Stott was one of the activists arrested as police moved to clear Waterloo Bridge on Sunday evening.
The London 2012 canoe slalom champion was carried from the bridge by four officers as he shouted about the “ecological crisis”.
An Extinction Rebellion spokesperson said there would be no escalation of activity on Easter Monday, but warned that the disruption could get “much worse” if politicians are not open to their negotiation requests.
On Sunday, one organiser told the BBC the group were planning “a week of activities” including a bid to prevent MPs entering Parliament.
The group said a “people’s assembly” was due to be held later to decide what will happen in the coming week.
On Sunday, Ms Thunberg was greeted with chants of “we love you” as she took to the stage in front of thousands of people at the rally.
The 16-year-old, who is credited with inspiring an international movement to fight climate change, told the crowd “humanity is standing at a crossroads” and that protesters “will never stop fighting for this planet”.
Met Commissioner Cressida Dick has said that during her 36-year career she had never known a single police operation to result in so many arrests.
What is Extinction Rebellion?
Since the group was set up last year, members have shut bridges, poured buckets of fake blood outside Downing Street, blockaded the BBC and stripped semi-naked in Parliament.
It has three core demands: for the government to “tell the truth about climate change”; to reduce carbon emissions to zero by 2025; and to create a citizens’ assembly to oversee progress.
Controversially, the group is trying to get as many people arrested as possible.
But critics say they cause unnecessary disruption and waste police time when forces are already overstretched.
A teenager has been charged with killing a 19-year-old at a hair salon in north London.
Kamali Gabbidon-Lynck was attacked in Vincent Road, Wood Green. Police had been called to reports of people fighting.
A 20-year-old man was also stabbed but his injuries were not life-threatening.
Tyrell Graham, 18 from Waltham Forest, has been charged with murder, attempted murder and robbery. He will appear before magistrates on Tuesday.