Khalid Masood Identified as London Parliament Attacker

The knife-wielding terrorist who killed an American tourist and two others outside the U.K. Parliament was British-born and previously investigated for "violent extremism." Police identified the suspect as Khalid Masood, 52, on Thursday. Authorities said Masood was born in Kent and detectives believe he was most recently living in the West Midlands. He was known by a number of aliases, police said.