( CNN ) -- An explosion ripped through a northern Pakistan mosque where people had gathered for evening prayers Thursday , killing eight people -- including a child -- and injuring 67 others , officials said . The incident occurred in the city of Peshawar , the minister of health in the region , Shaukat Yousafzai , told CNN . A child was among those killed , according to officials at Peshawar 's Lady Reading Hospital . The blast was under investigation , though police and intelligence officials said they believed it was caused by a bomb . The explosion happened at the start of what was supposed to be an overnight service in which congregants were to attend evening prayers , listen to a nighttime sermon and sleep there . Also Thursday , an undetonated bomb was found in a mosque in Nowshera , about 50 kilometers ( 30 miles ) east of Peshawar , police said . People found the bomb in a tin container near the mosque 's entrance before evening prayers and notified authorities , police said . A bomb disposal unit defused the device , police spokesman Turk Ali Shah said . Pakistan , where militants have a strong presence , has long been beset by violence .
Child among 8 killed in Peshawar mosque blast , hospital says ; dozens injured . Explosion happened during evening prayers , police say . An undetonated bomb was found at a mosque Thursday about 30 miles away , police say .