The couple sustained “serious” injuries and are recovering in a hospital, police said. The officer stabbed in the shoulder while subduing the suspect was released from hospital Tuesday.

Chief Constable Ian Hopkins commended the bravery of the four officers involved in stopping the attacker.

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“Last night we experienced a horrific attack on people out to simply enjoy the New Year’s Eve celebrations in Manchester,” he said in a statement. “We are treating this as a terrorist investigation which is being led by counterterrorism officers with support from Greater Manchester Police.”

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He added that they worked through the night to determine identity of the suspect. Police later searched an address in the city’s Cheetham Hill neighborhood.

Sam Clack, a BBC producer who was at the train station Monday night, told the BBC that police detained the suspect with pepper spray and an electric stun gun.

“I heard the guy shout, as part of a sentence, as part of a sentence, he shouted, ‘Allah.’ And then I thought, that doesn’t sound good,” he said, referring to the Arabic word for God.

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Clack also later tweeted that the suspect had a “long kitchen knife.”

The BBC also broadcast video footage of the suspect shouting “God is greatest” in Arabic as he was being taken away by police.

Manchester was the scene of a devastating suicide bombing at an Ariana Grande concert in 2017 that killed 22 people.

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British Prime Minister Theresa May tweeted that her “thoughts are with those who were injured in the suspected terrorist attack in Manchester last night,” and she thanked emergency services for their “courageous response.”