A powerful bomb exploded near the residence of an imprisoned anti-India militant leader in the eastern Pakistani city of Lahore, killing at least four people and wounding 15 others.
The blast took place in the Johar Town neighborhood, provincial police chief Inam Ghani told reporters Wednesday.
Officers are still trying to determine whether it was a suicide bombing or a remote-controlled bomb, he said.
Some police officers were among those injured, Ghani said.
He confirmed that the bombing took place near the residence of anti-India militant leader Hafiz Saeed, who has been designated a terrorist by the US Department of Justice and has a $10 million bounty on his head.
Saeed is the founder of the outlawed Lashkar-e-Taiba group, which was blamed for the 2008 Mumbai attacks that killed 166 people.
Homes were badly damaged showed in the TV footage, and many residents said it was a bomb attack.
Doctors say the condition of some of the injured is critical.