A man wielding a knife reportedly yelled “this is for Syria” before stabbing three people on the London Underground on Saturday.

The alleged assailant was eventually tasered and apprehended by police at the Leytonstone subway station, according to the Telegraph.

Police said they were investigating it as a terrorist attack, according to CNN.

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Sources told the paper that one of the victims was seriously wounded and may have been slashed in the throat.

A pedestrian captured the scene on video, showing civilians with children running and pools of blood by the turnstiles.

Authorities closed down the station for the rest of the day in order to investigate the scene.

This story was updated at 6:22 p.m.