Eight people were reportedly arrested across the U.K. overnight in the aftermath of the attack near Britain’s Parliament on Wednesday that left three people dead and at least 29 still hospitalized. Detectives carried out armed police raids at six addresses, in London, Birmingham, and elsewhere throughout the night, said Acting Deputy Commissioner and Head of Counter Terrorism Mark Rowley. Seven pedestrians were still in critical condition following the attack, during which a man identified only as a British citizen, said by Scotland Yard to be connected to “Islamic terrorism in some form,” drove a car across Westminster Bridge and ran over everyone in his path. He eventually crashed the car and then fled. He stabbed a police officer before he was finally shot dead.