London attacker born in Britain, previously investigated

LONDON — The man who mowed down pedestrians on a London bridge and fatally stabbed a police officer on Parliament's grounds was born in Britain and was known to intelligence services, the prime minister said Thursday.Theresa May, who didn't disclose the man's name, said that he was once investigated for extremism links, but was considered a peripheral figure.The revelation came moments after Parliament held a minute of silence and reconvened less than 24 hours after Wednesday's brutal atta