Almas did not have any information about casualties but a photo posted on Twitter purportedly taken at the scene of the attack shows a man lying on the ground, covered in blood.
There was no immediate claim of responsibility but Taliban and Islamic State jihadists, who belong to the rival Sunni branch of Islam, have repeatedly targeted the minority Shiite community in recent years.
There had been fears they would strike again as Shiites prepare to commemorate Ashura which falls this weekend and is the most important Shiite observance.
It falls on the 10th day of Muharram, which is the mourning period for the seventh-century killing of Imam Hussein, the grandson of the Prophet Mohammed.
The faithful gather to beat their chests and hit their backs with chains until they bleed in commemoration of Hussein's death.
But in recent years the sacred day has been marred by deadly violence.
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