British Police said seven people have been arrested, following the Westminster attack that left about five people dead in the United Kingdom.
Acting Deputy Commissioner and Head of Counter Terrorism, Mark Rowley; said hundreds of detectives worked through the night, and carried out searches at six addresses.
He added that the victims were a mix of nationalities, and included a woman in her 40s and a man in his 50s.
It would be recalled that in the attack yesterday, a man drove a car along a pavement in Westminster and knocked down pedestrians, leaving dozens injured.
He then stabbed a policeman and was shot dead by police in the grounds of parliament.