QUETTA, Pakistan (AP) — Police now say a bomb that's killed scores of people in southern Pakistan was hidden in a water tank.

Officials say at least 63 people were killed and another 180 wounded when the bomb exploded in a vegetable market in Quetta.

A senior police officer says the bomb was detonated by remote control in a mostly Shiite neighborhood. The blast left many victims buried under rubble, but it's uncertain how many.

Local residents rushed the victims to three different area hospitals. Many of the wounded are said to be in critical condition.

It was the deadliest incident since bombings in the same city killed 86 people earlier this year. That incident led to days of protest that eventually toppled the local government.

Shiites are a minority in Pakistan, where Sunni Muslims dominate. They have been increasingly targeted for attacks by militant groups who view them as heretics and non-Muslims.

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APPHOTO ISL104: Smoke rises from the site of a bomb blast in a market in Quetta, Pakistan on Saturday, Feb. 16, 2013. Senior police officer Wazir Khan Nasir said the bomb went off in a Shiite Muslim-dominated residential suburb of the city of Quetta. Residents rushed the victims to three different hospitals.(AP Photo/Arshad Butt) (16 Feb 2013)

<<APPHOTO ISL104 (02/16/13)>>

APPHOTO XMM104: A Pakistani man who was injured in a bomb blast is brought to a hospital in a Quetta, Pakistan, Saturday, Feb. 16, 2013. A bomb ripped through a crowded vegetable market in a mostly Shiite neighborhood in a southern Pakistani city Saturday, killing scores of people in a horrific attack on the country's minority Muslim sect. (AP Photo/Arshad Butt) (16 Feb 2013)

<<APPHOTO XMM104 (02/16/13)>>

APPHOTO XMM103: Pakistani security forces take positions in a street leading to the site of a bomb blast, top left, in Quetta, Pakistan, Saturday, Feb. 16, 2013. A bomb ripped through a crowded vegetable market in a mostly Shiite neighborhood in a southern Pakistani city Saturday, killing scores of people in a horrific attack on the country's minority Muslim sect. (AP Photo/Arshad Butt) (16 Feb 2013)

<<APPHOTO XMM103 (02/16/13)>>

APPHOTO ISL101: Volunteers gather next to the dead bodies of the victims of a bomb blast at the morgue of local hospital in Quetta, Pakistan on Saturday, Feb. 16, 2013. Senior police officer Wazir Khan Nasir said the bomb went off in a Shiite Muslim-dominated residential suburb of the city of Quetta. Residents rushed the victims to three different hospitals. (AP Photo/Arshad Butt) (16 Feb 2013)

<<APPHOTO ISL101 (02/16/13)>>