Two police officers are being investigated over alleged dangerous driving while responding to the Streatham terror attack.

One of the men was driving an unmarked police car towards the incident when it was involved in a crash with two other vehicles, injuring him and another person.

The other man was driving a marked armed response vehicle nearby and carried on to the scene of the attack in south London on 2 February.

The Independent Office for Police Conduct (IOPC) said both officers had been served notices of investigation for dangerous driving and gross misconduct.

The watchdog said the second car was “in close proximity to the unmarked vehicle but not involved in the collision”.

Streatham attack: Man shot dead by police after stabbings Show all 22 1 /22 Streatham attack: Man shot dead by police after stabbings Streatham attack: Man shot dead by police after stabbings Armed police officers on Streatham High Road. The Metropolitan Police warned people to stay away from the Streatham area boguta37/PA Streatham attack: Man shot dead by police after stabbings The man was shot dead by police after two stabbed in 'Islamist-related' terror attack in London boguta37/PA Streatham attack: Man shot dead by police after stabbings Sudesh Amman, the attacker, has been named as a convicted terror offender who was released from prison days ago Metropolitan Police/PA Streatham attack: Man shot dead by police after stabbings Items left on the pavement at the scene in Streatham High Road Isis supporter Amman was just 18 when he was jailed in December 2018 after police found a stash of bomb-making manuals and other propaganda. Now 20, he had declared his own wish to carry out a terror attack and stockpiled a combat knife, air gun and black flag at his family home in London PA Streatham attack: Man shot dead by police after stabbings He was being monitored by undercover police and being followed as part of a “proactive counterterrorism operation” when he started the rampage in Streatham AP Streatham attack: Man shot dead by police after stabbings Amman was able to stab two people before being shot dead by armed officers outside a busy row of shops Gabriel Video/PA Streatham attack: Man shot dead by police after stabbings A woman reacts as police officers interview people near to the scene Getty Streatham attack: Man shot dead by police after stabbings An armed police officer on Streatham High Road Deputy Assistant Commissioner Lucy D’Orsi said Amman was wearing a fake suicide ves Gully/PA Streatham attack: Man shot dead by police after stabbings Police forensic officers work outside of a Boots store AFP via Getty Streatham attack: Man shot dead by police after stabbings Police officers at the scene Getty Streatham attack: Man shot dead by police after stabbings A police forensic officer works at the scene in Streatham High Road PA Streatham attack: Man shot dead by police after stabbings Items left on the pavement at the scene in Streatham High Road PA Streatham attack: Man shot dead by police after stabbings A police officer on the scene Dave Chawner/SWNS Streatham attack: Man shot dead by police after stabbings Police forensic officers are seen near the site Reuters Streatham attack: Man shot dead by police after stabbings Police officers on the scene outside an Iceland supermarket Andy Bullemor/SWNS Streatham attack: Man shot dead by police after stabbings Police are seen near a site where a man was shot Reuters Streatham attack: Man shot dead by police after stabbings A policeman secures the site of the incident EPA Streatham attack: Man shot dead by police after stabbings A view of the scene Megan Tobeck Streatham attack: Man shot dead by police after stabbings Armed police at the scene in Streatham High Road PA Streatham attack: Man shot dead by police after stabbings A view of the scene Michael Owens Streatham attack: Man shot dead by police after stabbings Police forensic officers at the scene PA Streatham attack: Man shot dead by police after stabbings A Police officer is seen near a site where a man was shot Reuters

The Metropolitan Police Federation, which represents rank-and-file officers, called the investigation a "complete joke".

"These officers and their colleagues put their lives on the line that day to protect the public," said chairman Ken Marsh. "Now potentially their careers are on the line. It’s absurd.

"The the last thing officers responding to a terrorist attack should be worrying about is whether their prompt response and bravery will put their livelihoods in danger."

The IOPC is separately investigating the circumstances around the fatal shooting of attacker Sudesh Amman, who was being monitored by security services following his released from prison.

The watchdog previously revealed that police bullets went through the windows of a supermarket and a pharmacy after officers opened fire, causing one woman to be injured by flying glass.

Amman, a 20-year-old Isis supporter, was being followed by undercover police on foot when he grabbed a knife from inside a shop and started attacking people.

Two victims, a man and a woman, were stabbed before Amman was shot dead. Both survived.

The IOPC said no individual officers were under investigation in relation to the shooting, but said it would assess the “actions and decisions, including the use of lethal force” of those involved.

It will examine what information police had and the action they took following Amman’s release from prison on 23 January, where he had been serving a sentence for terror offences.

IOPC director for London Sal Naseem said: “It is important that we establish what information the police had and how they responded to it in the days after Amman’s release and prior to his death.”

Sadiq Khan warns Streatham attack was 'preventable'

The Metropolitan Police commissioner previously defended the undercover officers who were following Amman when he launched his attack.

When questioned on whether it could have been prevented, Dame Cressida Dick said covert surveillance did not equate to “man-to-man marking”.

“It is inevitable that there could be a time delay before somebody totally unexpectedly does something,” she added.

“I wish I could assure the public that everybody who poses a risk on the streets could be subject to some sort of thing that would stop them being able to stab anybody ever, but it is clearly not possible.”

Amman had grabbed the knife from inside a shop, but was already wearing a fake suicide vest in apparent preparation for an attack.

Scotland Yard previously said the device “had been concealed under his clothes”, suggesting the officers did not see it until after he started stabbing people.

Police said Amman was inside the shop for less than a minute, and that he was shot dead within 60 seconds of starting the attack.

The attack came little after a week from when he was automatically released from prison, halfway through a sentence for collecting and distributing material useful for terror attacks.

Amman had originally been arrested on suspicion of planning an attack in May 2018, after writing that he was “armed and ready” online, declaring support for Isis and encouraging his girlfriend to behead her non-Muslim parents.

But he was charged with lesser offences on advice from the Crown Prosecution Service and received a sentence of three years and four months.

The Streatham stabbing was the third terror attack in little over two months to be committed by a convicted terrorism offender, following the incidents at Fishmongers’ Hall and inside HMP Whitemoor.