Forensic officers attend the scene in central London, Saturday, Nov. 30, 2019, after an attack on London Bridge on Friday. UK counterterrorism police on Saturday searched for clues into how a man imprisoned for terrorism offenses before his release last year managed to stab several people before being tackled by bystanders and shot dead by officers on London Bridge. Two people were killed and three wounded. (AP Photo/Alberto Pezzali)in London, Saturday, Nov. 30, 2019.(AP Photo/Alberto Pezzali)