Police are investigating whether a man accused of stabbing 10 people on a train is linked to an attack on a 14-year-old boy and to two reports of a knifeman at a barbers' shop.
Cambridgeshire Police said it was reviewing the incidents following the knife attack on the London-bound LNER train after it passed through Peterborough at about 19:40 GMT on Saturday.
On Friday the teenager was attacked in the city and a man was reported to be at a barbers' shop carrying a knife. The shop made a second report of a man carrying a knife the following morning.
Anthony Williams, 32, of no fixed abode, has been remanded into custody after being charged with 10 counts of attempted murder.
Cambridgeshire Police said in all three incidents a "crime was raised" and investigations launched.
