Islamabad - At least one person was killed and several more were injured on Monday in an explosion outside an office of the police's intelligence wing in the Pakistani capital Islamabad, an eyewitness said.

"It was apparently a suicide bombing," said Ramzan Ahmad. "The bomber blew himself up when he was stopped at the gates of the police' special branch office."

Ahmad said he saw at least one body at the site of the attack. Several victims were moved to the hospital by rescue teams while police cordoned off the site.

The bombing took place in the heart of Islamabad, just a few hundred yards away from the headquarters of Pakistan's premier intelligence agencies. (dpa)