A car bomb exploded near a police post in the western city of Cali on Sunday night as officers were lured by a bogus fire alarm, killing at least one person and injuring at least 18, authorities said. It appeared the person who set off the blast was killed by police trying to flee the attack site, Cali's mayor, Jorge Ivan Ospina, told reporters. The victims' identities were not immediately known, Associated Press reported. President Alvaro Uribe blamed the country's main rebel group, the Revolutionary Armed Forces of Colombia, for the attack. He did not say why he suspected the group was behind the attack. A doctor at Bogota's San Juan de Dios hospital, Ivan Gonzalez, told Caracol Radio that 18 people were treated for injuries suffered in the blast, six of them children. He said most of the injuries were minor. Cali's police chief, Gen. Gustavo Ricaurte, said the bomb went off when police were responding to what turned out to be a false fire alarm. The bomb went off five blocks from the city's courthouse, where a bombing killed four people and wounded 26 on Aug. 31.