At least 20 people were wounded in a car bomb explosion in central Colombia, the third such attack in as many days, police said. The blast, near a gas station in San Martin town, 200 kilometers (124 miles) southeast of Bogota, also caused substantial material damage, Meta department police commander Colonel Jose Arnulfo Oliveros said. "There are some 20 wounded and serious material damage. The entire area has been cordoned off and the victims are being cared for," he said. Oliveros blamed the Revolutionary Armed Forces of Colombia (FARC), which has a strong presence in San Martin and other parts of Meta Department. "Obviously, this attack was committed by the FARC, the only terrorists who attack the civilian population in the country," he said. He announced a 20-million-peso (7,000-dollar,6,200-euro) award for information leading to capture of the culprits. Earlier a Meta police spokesman told AFP that the attacker had planned to slam the van into the gas station, but the explosion happened first. The driver was seen jumping from the van just prior to the blast at around 8 pm (0100 GMT), the spokesman said. "We are searching for this person, some of whose belongings were found in the area," he said. The explosion was the third car bomb attack in the troubled South American nation in as many days. A civilian was killed and a police officer wounded Saturday when a car loaded with explosives was detonated along a highway between Bogota and Caqueza, about 80 kilometers (50 miles) from the capital. Friday, five civilians, including two children, were burned to death by a car bomb apparently meant for a passing military patrol in oil-rich northeastern Colombia, local officials said. Authorities also blamed the 17,000-strong FARC, Colombia's oldest and biggest rebel group, for that attack. **PHOTO CAPTION*** Military policeman guards sacks containing part of a 3.5 ton seizure of explosives in Bogota, allegedly for use in attacks. (AFP/File/Gerardo Chaves)