The Taliban in Pakistan says it was behind a suicide bomb that killed 13 people on Wednesday night during Shi’ite processions in the city of Rawalpindi.
The blast ripped a hole in the walls of a Shi’ite mosque. Hardline Sunni militant groups have recently stepped up attacks against Pakistan’s minority Shi’ites whom they regard as non-Muslims.
Two other bomb blasts killed at least three people during another Shi’ite gathering in Karachi.
It came just hours before the Pakistani capital, Islamabad, hosts a summit of eight developing nations including Iran, Egypt, Turkey, Indonesia, Malaysia, Nigeria and Bangladesh. They are expected to discuss ways of boosting trade and investment.
Thousands of security personnel have been deployed in a bid to avoid further attacks.