Police in Colombia say nine people were injured - some seriously - when a car bomb exploded in an apparent attack on a prominent senator in Bogota, late Monday.

Officials say Senator German Vargas Lleras was driving away from a radio station in north Bogota as the bomb was detonated. Police say the senator was unharmed, but three of the his body guards were among the injured.

In 2002, Senator Vargas Lleras himself was injured by a letter bomb believed to have been sent by leftist rebels.

The 43-year-old senator is a staunch supporter of President Alvaro Uribe. The president spoke to reporters at the scene of the attack and offered a reward of more than $200,000 for information leading to the arrest of those responsible.

Some information for this report provided by AFP, AP and Reuters.