As the military prepares to move in on the Taliban heartland in South Waziristan, it has been confronted by a series of bold attacks claimed by the group.

Four deadly assaults in just eight days, including an attack inside the army headquarters in Rawalpindi, have exposed Pakistan's increasingly fragile security situation.

As Al Jazeera's Kamal Hyder reports from Rawalpindi, the increased violence is raising questions about the country's ability to confront the threat within its own borders.