Suicide bombing at Pakistan Shiite shrine kills 75

An ISIS suicide bomber struck inside a famed shrine in southern Pakistan on Thursday, killing at least 75 people in the deadliest attack in the country in more than two years.

The bomber entered the main hall of the shrine of Lal Shahbaz Qalandar in Sehwan and detonated his payload amid dozens of worshippers, according to three security officials, who said at least 20 women and nine children were among the dead.

The officials spoke on condition of anonymity because they were not authorized to brief reporters. Fazal Palejo, a senior health official in Sindh province, confirmed the toll.

The ISIS group claimed the attack in a statement circulated by its Aamaq news agency, saying it had targeted a "Shiite gathering." The Sunni extremist group views Shiites as apostates and has targeted Pakistan’s Shiite minority in the past. It views Sufi shrines like the one targeted Thursday as a form of idolatry.

Local TV showed graphic footage of the aftermath of the blast, with wounded worshippers crying out for help and the floors covered with shoes, blood and body parts. Women cried and beat their chests in grief.

Prime Minister Nawaz Sharif vowed that security forces would track down the perpetrators of the attack, according to Pakistani state TV.

"Each drop of the nation’s blood shall be avenged, and avenged immediately," Pakistan’s army chief, Gen. Qamar Javed Bajwa, said in a statement. "No more restraint for anyone."

Thursday’s attack was the deadliest in Pakistan since Dec. 16, 2014, when militants assaulted an army-run school in Peshawar, killing 154 people, mostly schoolchildren.