 London police have searched a house which is believed to have been home to the suspected murderer of Sir David Ames, a lawmaker who was killed in a stabbing attack on Friday. The police arrested a 25-year-old man at the scene of the attack on suspicion of the murder. He is still in custody and the police are not currently looking for anyone else in connection with the attack. On Saturday, the Metropolitan Police said early investigations revealed a potential motivation linked to Islamist extremism. 69-year-old Ames had been a member of Parliament since 1983.