Colombia reports killing top aide to rebel chief

Colombia's army says it has killed the security chief for the head of the country's main rebel group.

Army spokesman Col. Fernando Avila says that Alirio Rojas Bocanegra was killed in an area about 140 miles (230 kilometers) southwest of Bogota, the nation's capital. He gave few details on Saturday.

Avila says that Rojas was leader of the security forces for the top leader of the Revolutionary Armed Forces of Colombia. Guillermo Leon Saenz took over the top job in 2008.

Authorities estimate the rebel group's strength at about 8,000 — half what it was a decade ago.