QUETTA, Pakistan – A bomb hidden in a water tank ripped through a crowded vegetable market in a mostly Shiite neighborhood in a southwestern Pakistani city Saturday, killing at least 81 people and wounding almost 200, officials said.

Police said many of those wounded in the explosion in Quetta remain in critical condition. The blast, which police said targeted the country’s minority Shiite Muslim sect, left many victims buried under rubble, but authorities did not know how many.

It was the deadliest incident since bombings targeting Shiites in the same city killed 86 people earlier this year, leading to days of protests that eventually toppled the local government.