Screencap: Twitter/Jeremy Chang

Authorities in London say a man with a knife attacked several people in Russell Square Wednesday night, leaving at least one women dead and up to five other people injured. According to police, the incident is being investigated as a potential terror attack, among other possibilities.

The Metropolitan Police Service say that a suspect has been arrested after being Tasered. The condition of the surviving victims has not been released at this time.

UPDATE 11:05 P.M.: According to BuzzFeed, police believe mental health “is a significant factor” in the attack.