In pictures: Pakistan mosque attack

1 of 6 Dozens were killed or hurt when the attackers struck with hand grenades and automatic weapons during Friday afternoon prayers

2 of 6 The Quetta authorities imposed a curfew to curb riots that broke out after the deadly attack by gunmen on the Shia mosque

3 of 6 Shia rioters firing shots into the air dispersed when the curfew was announced over loudspeakers

4 of 6 An emergency was declared at Quetta's main hospital where the injured were brought

5 of 6 No one has claimed responsibility, but the minority Shias are blaming Sunni extremists

6 of 6 Thousands have died in sectarian killings in Pakistan since the late 1980s