An explosion at a mosque used by Shia Muslims in the eastern Pakistani city of Lahore has killed at least four people, including a 13-year-old boy. A suicide bomber detonated a device as people had gathered for evening prayers at the Husainia Hall mosque in an old part of Lahore, police said. Two security guards were among those killed – eight people were injured. A series of attacks blamed on Sunni and Shia militants have claimed more than 70 lives in Pakistan this month alone. Full Story