Officials are acting swiftly in the attack in London yesterday.
Seven people are under arrest in connection with the deadly attack on Britain's Parliament. Scotland Yard's top counter-terrorism official Mark Rowley told reporters in London this morning that raids had been carried out in six addresses in London, Birmingham and elsewhere.
Rowley also lowered the number of dead in yesterday's attack to four. They include a police officer, a woman in her 40s and a man in his 50s, along with the attacker. Seven of the injured are still in hospital in a critical condition while 29 more were treated at a hospital.
He said it was still his belief the attacker worked alone and was inspired by "international terrorism," but did not reveal the attacker's identity. We told you earlier, the attacker stabbed a police officer to death outside Parliament, after mowing down people on Westminster Bridge yesterday. Officers shot and killed the man.