(LONDON) — A 32-year-old man has been arrested on suspicion of attempted murder for allegedly attacking multiple people with a knife aboard a train headed to London on Saturday evening, according to police, a crime the prime minister called an “appalling incident.”

In a statement shortly after the attack, British Transport Police (BTP) said two people had been arrested. On Sunday afternoon, however, police said a 35-year-old London man initially taken into custody had been released after investigators determined he was not involved.

The victim who was most seriously injured in the attack is a member of the London North Eastern Railway (LNER) staff, who was stabbed when he intervened in an attempt to stop the attack.

Deputy Chief Constable Stuart Cundy of the BTP praised the railway staf

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