The attacker tried to enter the imambargah, or Shiite congregation hall, during evening prayers at 6:45 p.m. but was stopped by a security guard, Islamabad police said.
The bomber detonated his explosives outside the building, police said.
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Journalist Adeel Raja reported from Rawalpindi. CNN’s Sophia Saifi reported from Islamabad, Pakistan. CNN’s Jason Hanna contributed to this report.
