At least 15 people were killed and 16 others injured in an explosion on Saturday at a bank branch in Karachi's industrial area, police said, APA reports quoting Reuters.
A senior police officer said the blast at a branch of Habib Bank Limited, Pakistan's largest lender, could have been caused by a gas leak, Sarfaraz Nawaz also told reporters that the building appeared to have been constructed over a sewage drain.
"Our explosives teams are at work trying to ascertain the nature of the blast, but apparently the structure was constructed on a drain and gas could be a probable cause," he said.
In statement on Twitter, Habib Bank said an explosion had damaged its branch and caused casualties and injuries.