She was on her way to Jinnah's tomb near the center of Karachi. Happened around 12:15, over 125 dead, over 540 injured. Went off near a few police vans and PPP security cars. Benazir Bhutto was riding in a fortified, bullet-proof truck. That may have saved her life.
The twin blasts were staggered by less than a minute. GeoTV is reporting that it seemed like the combination of a suicide bomber and a car bomb. Reuters has documentation of the carnage and destruction.
There were more than a few direct threats against her.
The city has shut down. Police and Rangers have closed down major ports.
Details are, at the moment, sketchy.
The GeoTV anchor just called it Qiyamat-i Sughra - the Lesser Apocalypse.
Karachi Metblog has reports from the city.
With this attack, Karachi joins the list of cities hit by major terrorist attacks since NYC, Bali, Madrid, London, Mumbai.