QUETTA, Pakistan - A bomb exploded beside a bus on the outskirts of Pakistan's southwestern city of Quetta on Thursday, killing at least 10 people in a suspected sectarian attack, police officials said.

At least 30 people were wounded in the bombing. Police and hospital officials in Quetta, capital of the Baluchistan province, said the death toll could rise.

"The bus was bringing Shi'ite pilgrims back from Iran when a bomb exploded next to it," police official Hamid Shakeel said.

Several militant groups are active in Baluchistan, Pakistan's biggest but poorest province.

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