Sharon Behn ISLAMABAD — Pakistan’s prime minister, Nawaz Sharif, huddled with top military and government officials Tuesday to hammer out a security strategy following a complex terrorist attack in the capital that left 11 dead and two dozen wounded. Eyewitnesses to Monday’s gun, grenade and suicide bomb attack on a courthouse in a busy shopping area in central Islamabad said police were not able to protect the victims from the militants. Security analysts have said that an effective police force was critical to fighting the country’s violent insurgency. A former inspector-general of the…