Two suicide bomb attacks, targeting Pakistani security forces, have killed at least 20 people.
The bombings further spiked political tensions amid a crisis over emergency rule.
In Rawalpindi, a garrison city near Islamabad, an explosives-laden vehicle rammed a military bus as it entered a compound, while another exploded at a checkpost almost simultaneously.
President Pervez Musharraf is under fierce international pressure to repeal the emergency measures and is also facing the return of Nawaz Sharif, his biggest political foe.
Sharif's return from exile will change the political dynamics in Pakistan ahead of 8 January general elections which opposition parties are threatening to boycott.
Mr Musharraf the latest attacks, vowing they 'cannot deter the government from continuing its fight against terrorism.'
