2 children among dead in Pakistan blasts June 21, 2012 -- Updated 1532 GMT (2332 HKT) Two 5-year-olds died, police said One explosion took place near a Sufi shrine in Peshawar Another strike occurred at a Quetta mosque Many injuries were reported in both incidents Islamabad, Pakistan (CNN) -- Two 5-year-olds were among four people killed in blasts across Pakistan on Thursday, authorities said. At least three people died in an explosion in a Peshawar graveyard. It occurred near a Sufi holy shrine for the sainted poet Rehman Baba. A boy and girl were among the dead. Seven women and four children were among 21 injured, police said. Officials fear that the death toll will rise because the blast occurred during a busy time of the week. Militants detonated an explosive in a donkey cart outside a walled compound containing five graves. Taliban militants, who are hard-line Sunnis, targeted the shrine three years ago. There have been many acts of violence and intolerance against religious minorities, including Sufis, in the predominantly Sunni nation over the years. In Quetta, one person was killed and 18 others were injured outside a mosque where people were preparing for prayers, a government official said. Muhammad Hashim Ghilzai said attackers planted a bomb in a sleeping bag near a pillar. It damaged a portion of the mosque and nearby buildings. Journalist Syed Ali Shah contributed to this report.