Suspect held under mental health law

A British probe into a stabbing at a Manchester railway station on New Year's Eve which injured three people is being treated as "a terrorist investigation", the city's police force said on Tuesday.

The 25-year-old man who was arrested at the scene on Monday night is now being detained under a mental health law, Greater Manchester Police (GMP) said late Tuesday.

The suspect reportedly shouted "Allah" and "long live the Caliphate" during what GMP Chief Constable Ian Hopkins called a "horrific attack" on three people, including a police officer.

"(The) man arrested last night... following the incident at Manchester Victoria Station has been assessed by specialist medical staff and detained under the Mental Health Act," GMP said in a statement.

"The Counter Terrorism investigation remains ongoing.

"There is nothing to suggest the involvement of other people in this attack, but confirming this remains a main priority for the investigation," the force added.

A man and a woman, both in their 50s, were being treated in hospital Tuesday after sustaining serious but not life-threatening injuries to their abdomens, while the British Transport Police officer was stabbed in the shoulder, the GMP chief added.

Prime Minister Theresa May thanked emergency services for their "courageous response" in swiftly tackling the suspect.

No group has claimed responsibility for the attack, which happened at around 8:50 pm (2050 GMT) when many revellers in the city would have been enjoying New Year's Eve celebrations.