Places that attract crowds are becoming more and more dangerous for Pakistanis.<br /><br />Since the army launched a fresh offensive against the Taliban, there have been virtually daily bombings and killings.<br /><br />Fear of attacks has caused a big fall in the number of worshippers for Friday prayers at Pakistan's biggest mosque.<br /><br />Al Jazeera's Imran Khan reports from the Shah Faisal mosque in Islamabad, a week after attackers killed 36 people in a mosque in the country's north.