This is the horrifying moment a man believed to be the Huntingdon suspect stormed into a Peterborough barber shop with a knife moment after allegedly stabbing a 14-year-old boy.

Anthony Williams, 32, of Peterborough, appeared at Peterborough magistrates' court today charged with 11 counts of attempted murder in relation to the train attacks and another in east London on November 1.

Police have today launched a probe to establish whether the three other incidents, including a report of the man returning to the barber shop on the morning before he is alleged to have injured 11 people on a train with a knife are linked.

CCTV footage exclusively obtained by the Daily Mail allegedly shows Williams entering Ritzy Barbers in Peterborough, Cambridgeshire, on Friday.

Williams appears to be frantically waving a huge knife around and shouting as terrified customers run to the back of the barber shop.

Cambridgeshire Police said they are 'aware' of the three incidents that took place on October 31 and November 1 and are 'currently reviewing all incidents in the timeframe to understand whether there were any further potential offences'.

The first of the three other incidents under review involved a man who stormed into Ritzy Barber's shop in Fletton, Peterborough, and waved a knife at terrified customers and staff at 7.25pm on October 31.

However, it was no reported to police until 9.10pm - nearly two hours later.

'At the time of reporting the man was no longer there and had not returned, so we did not send officers, but a crime was raised,' the force said in a statement.

In another incident which occurred just two hours before and which Cambridgeshire Police 'believe may be linked' to Williams, a 14-year-old boy was stabbed by a man with a knife in the city centre at 7.10pm.

The boy was taken to Peterborough City Hospital with minor injuries and was later discharged.

Cambridgeshire Police's statement added: 'The offender had left the scene when the call was made and despite a search of the area by officers and a police dog, the offender was not identified.

'A crime was raised and an investigation commenced, with scenes of crime attending.'

The following day, police were called at 9.25am with a report the man had returned to the barbers shop and was still on the scene - with officers racing there in just 18 minutes.

However, cops were unable to locate or identify the man when they searched the area and a crime was raised.

In their statement, the force added: 'We are currently reviewing all incidents in the timeframe to understand whether there were any further potential offences.

'British Transport Police retain primacy for the overall investigation, which will include these three incidents.

'We voluntarily referred ourselves to the IOPC for independent scrutiny of these incidents, as is standard practice in these cases.'

Williams is also accused of attempting to kill a man after a passenger was stabbed at Pontoon Dock Docklands Light Railway (DLR) station in east London shortly after 12.45am on November 1.

It is alleged the victim suffered facial injuries after being attacked with a knife.

Hours later, Williams is accused of going on a knife rampage on the high-speed 6.25pm LNER service from Doncaster to London's King's Cross, where he allegedly attempted to murder 10 other people.

He is also facing two charges of possession of a bladed article on both the train and at the DLR station in London, and of assault occasioning actual bodily harm.

Williams appeared at Peterborough magistrates' court today in handcuffs, accompanied by four prison officers.

He appeared in the dock wearing a grey sweatshirt and tracksuit bottoms.

The defendant spoke only to confirm his name and address during the six-minute hearing, mumbling to the court that he was of no fixed abode.

Documents allege that he used a 'large kitchen knife' in both incidents. No application was made for bail.