CNN - RAWALPINDI, Pakistan (CNN) -- Pakistan former Prime Minister Benazir Bhutto has died after a suicide bombing that killed at least 14 of her supporters, ex-government spokesman Tariq Azim Khan and Pakistan's primary television networks said.

Bhutto suffered bullet wounds in the aftermath of the bomb attack, TV networks report.

Video of the scene just moments before the explosion showed Bhutto stepping into a heavily-guarded vehicle to leave the rally.

Khan said while it appeared Bhutto was shot, it was unclear if her bullet wounds were caused by a shooting or shrapnel from the bomb.

The suicide attack left at least 14 dead and 40 injured, Khan told CNN in a telephone interview.

The attacker is said to have detonated a bomb as he tried to enter the rally where thousands of people gathered to hear Bhutto speak, police said.