ISLAMABAD, Oct. 10 (Xinhuanet) - At least four people including a suicide bomber were killed when a powerful bomb exploded at a Shiite Muslim mosque in eastern Pakistani city of Lahore on Sunday,the Associated Press of Pakistan (APP) reported.

    A witness said a man carrying a briefcase tried to enter the Husainia Hall mosque in the ancient walled part of the city during evening prayers but was blocked by security guards. He then detonated a bomb in the briefcase.

    Four people were killed and several others injured, the APP quoted Punjab province Home Secretary Hassan Waseem as saying.

    The bomb went off at the mosque at 5:40 p.m. after prayers, said a senior official of Punjab province. Dozens of people were inside the mosque when the blast went off, police said.

    No one has claimed responsibility for the explosion so far.

    The attack was the third this month against a religious target in Pakistan's Punjab province.

    On October 1, a suicide bombing at a Shiite mosque killed 31 people in Sialkot city, then on Thursday, a car bombing at central Pakistan city of Multan killed 40 people. Enditem