Militants waging a terror campaign against rival Muslims and the government killed 33 people Sunday, firing grenade launchers and burning several buildings in Pakistan’s financial center.

Police said several victims had been tortured, their throats slit and their legs and hands tied. “These people are being executed. It’s frightening,” said Karachi Police Commissioner Zia-ul Islam.

The rampage by the militant Mohajir Qaumi Movement has killed nearly 75 people since Thursday night. Over the past five weeks, more than 300 people have been killed.