Bombers attacked the cavalcade of Benazir Bhutto last night as the former Pakistani prime minister triumphantly paraded through Karachi after eight years in self-imposed exile
Ms Bhutto was reported to be safe, but at least
139 people were killed and more than
500 injured as two blasts detonated in the heart of the tightly-packed crowd causing carnage and chaos.
Intelligence reports had suggested at least three jihadi groups linked to al-Qa'eda and the Taliban were plotting suicide attacks. But Ms Bhutto's husband blamed an unnamed Pakistani intelligence agency for the assassination attempt.
Our people have died, our workers have died, they have sacrificed their lives for the sake of democracy in Pakistan."
Last night Ms Bhutto was safe and at her home after evacuating the specially-armoured truck that had been transporting her through streets crowded with hundreds of thousands of people,
"Ms Bhutto is safe and she has been taken to her residence," said Azhar Farooqui, a senior police officer in Karachi.
A British journalist who was travelling on the vehicle when the bombs detonated said Ms Bhutto was downstairs in a special armoured compartment in the vehicle.
Christina Lamb told Sky News: "Suddenly there was a massive blast. We were all thrown onto the floor and everybody was shouting "Down! Down!"
The bombers struck at around midnight despite the presence of some 20,000 security personnel deployed to provide protection. At least 20 of the dead were policemen who were in three police vans that were completely destroyed by the attack.
Ms Bhutto, shaken but unhurt by the blast, and leading members of her party were whisked away in a high-security operation from the scorched and charred vehicle amid smoke and debris.
An initial small explosion was followed moments later by a huge blast just feet from the front of the truck.
Rescuers scrambled to drag bodies from the twisted wreckage of blazing vehicles as flames lit up the night sky in Pakistan's most violent city. Eyewitnesses described seeing the ground strewn with body parts.
Television footage showed horrific images of the dead and wounded being ferried in fleets of ambulances, taxis and private cars to hospitals. Last night anxious relatives were reported to be crowded around hospitals desperate for any news of the dead and injured.
"After the blast there were a lot of people scattering everywhere. I couldn't understand what happened. My brothers and my family were injured," Muhammad Ali Balunch told local television.