Islamabad/Karachi, Oct 21 (PTI) A powerful explosion ripped through a four-storey building in Pakistan's Sindh province, killing at least five people and injuring 20 others, police said.

At least two floors of the building near Maskan Chowrangi in the Gulshan-e-Iqbal area in Karachi were severely damaged, leading authorities to fear that the toll may rise.

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The death toll in the incident has increased to five, Faisal Edhi of the Edhi Ambulance Service said.

Seven of the injured are said to be in critical condition.

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The security forces have cordoned off the area after the explosion.

Police chief Mushtaq Mahar said the bomb disposal squad and anti-terrorism officials are yet to determine the cause of the explosion.

A police official said that initial investigations suggested that the explosion could have been caused due to a gas leak.

The official said that no trace of an improvised explosive device (IED) was found at the scene.

The incident happened a day after five people were injured when an IED bomb exploded at the entrance of a bus terminal in the Shireen Jinnah colony area of the city.

Media reports said that the explosion was so powerful that it shattered the windows of nearby buildings and also damaged vehicles.

Sindh Chief Minister Syed Murad Ali Shah has sought a detailed report of the incident from the authorities.

(The above story is verified and authored by Press Trust of India (PTI) staff. PTI, India’s premier news agency, employs more than 400 journalists and 500 stringers to cover almost every district and small town in India.. The views appearing in the above post do not reflect the opinions of LatestLY)