In London, a man driving an SUV mowed down pedestrians on a bridge over the River Thames Wednesday, before rushing onto the grounds of the British Parliament and fatally stabbing a police officer. Police say the attacker was shot dead following the afternoon rampage, which left two others dead and at least 29 more injured. The assault put Parliament on lockdown and suspended debate in the House of Commons. It drew swift condemnation from world leaders, who called it an act of terrorism. Police say they arrested eight suspects in London and Birmingham overnight, but said they believe the attacker acted alone. Prime Minister Theresa May said today the assailant was British-born and known to British intelligence. [After our broadcast police identified the suspect as a 52-year-old Kent man named Khalid Masood.]