Initially, two men were suspects in the attack, but a 35-year-old British national of Caribbean descent has been released with no further action. A 32-year old black British man was arrested on suspicion of attempted murder. Neither the suspect, nor the man who was released, have been identified by name, leading people to question whether they are migrants.
The attack was declared "Plato" – the national codeword when responding to a "marauding terrorist attack" – before rescinding it later.

British Transport Police Superintendent John Loveless said that "At this stage, there is nothing to suggest that this is a terrorist incident." He added that it not be appropriate to speculate on the cause of this incident.

UPDATE: Anthony Williams was arrested and charged with 10 counts of attempted murder. He may be linked to a string of knife incidents in the hours before the bloody rampage against a 14-yera old boy and two reported incidents in a barber shop. There is no word about whether he is a migrant.

ZeroHedge reported that a hero older man blocked a knife-wielding attacker from stabbing a younger girl as victims fought back with a bottle of Jack Daniels during Saturday's UK train attack, according to a report. The unidentified man suffered gashes to his head and neck while preventing the train attackers from slaughtering a youngster on the blood-soaked LREN train from Peterborough to London, Witness Olly Foster told the BBC.