At least six people are thought to have been killed in an explosion at a house in the Pakistani city of Karachi.
The blast happened in Balida Town, a poor neighbourhood of the southern city, Pakistan's commercial hub. The blast's cause was not immediately known, but police said explosives had stored at the house may have gone off.
In December, a suicide bomb attack on a Shia Muslim march in Karachi, claimed by the Taliban, killed 43 people and injured dozens more.
"There was a blast in a house in [Karachi's] Balida Town in which six people were killed. The house collapsed. We are trying to ascertain the exact nature of the blast," senior police official Abdul Majeed Dasti told the AFP news agency.
He said hand grenades and a Kalashnikov rifle had been found at the site of the explosion.
Karachi police chief Waseem Ahmad said explosives stored in the house appeared to have caused the explosion.
"It seems that the house was being used by terrorists. We are taking utmost care in removing the rubble," Mr Ahmad.
It was not clear whether the dead were residents of the house or were passers-by.
Pakistan has seen an upsurge in violence in recent months.
Hundreds of civilians have died in bomb attacks as Pakistan's army concludes an offensive against Taliban militants in South Waziristan and surrounding areas.
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