Police in England say a 31-year-old man has been arrested on suspicion of murder after stabbing three people to death and running down three other people in a stolen van in the city of Nottingham.
Police say the man is believed to have acted alone.
However, counter-terror officers are involved in the investigation and have an "open mind" about a motive.
One of those hit by the van is in hospital in a critical condition while the two others are believed to have suffered minor injuries.
A vigil has been held in the city for people to pay their respect to the victims.
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