Dozens of people are feared to have been killed in two separate suspected suicide attacks against security forces in Pakistan.

A suicide bomber rammed a car into a defence ministry bus outside an intelligence service office in garrison city of Rawalpindi on Saturday.

Another bomber blew up his vehicle outside Pakistan's army headquarters.

Al Jazeera correspondent Kamal Hyder said: "The blast outside the intelligence agency was very powerful and the casualties are likely to be in the dozens."

At least 35 people were killed in the attacks, police officials told the Associated Press news agency, while security officials told the AFP agency at least 16 had died.

Political turmoil

Witnesses said a burned-out bus could be seen parked just inside the gates of the military spy agency, with dozens of ambulances stationed around.

"There were 50 people sitting in the bus. Many are injured, many are okay," army spokesman major-general Waheed Arshad said.

The blasts come amid political turmoil in Pakistan, which is still under emergency rule imposed by Musharraf in what has widely been seen as an attempt to safeguard his presidency from challenges to his re-election.

Pakistan's supreme court, manned by judges supportive of Musharraf, has since dismissed them.

Twin suicide blasts in the city in September killed 25 people and wounded 70, many of them aboard an intelligence services bus.

Another suicide attack killed 15 soldiers near the capital the same month.

A suicide attacker blew himself up near Musharraf's army residence in Rawalpindi, killing seven people, in October.

PHOTO CAPTION