Seven killed in suicide attack during protest in northern Pakistan: Police

A suicide bomber attacked a busy area during a protest in northern Pakistan's Swat district, killing seven people and wounding more than 20, police said on Sunday. 

"The attacker... detonated his explosive vest, killing seven people, including four police officers, and injuring more than 20 others," Swat's Deputy Inspector General of Police, Fida Hussain, told AFP.