UK parliament attacker British-born, had been investigated over extremism concerns

By Elizabeth Piper and William James
LONDON (Reuters) – The attacker who killed three people near the British parliament before being shot dead was British-born and was once investigated by MI5 intelligence agents over concerns about violent extremism, Prime Minister Theresa May said on Thursday.
The Islamic State group claimed responsibility for the attack in a statement issued by its Amaq news agency. But it gave no name or other details and it was not clear whether the attacker was dir