The editor of Colombia's top newsmagazine says gunmen fired five shots at its prize-winning investigations chief, but he was uninjured.

Semana editor Alejandro Santos says Ricardo Calderon was attacked Wednesday night by two gunmen who got out of a car and called his name when he stopped at a toll booth in Girardot, a town southwest of Bogota.

Santos says Calderon escaped by diving into a dark roadside ditch.

The 42-year-old Calderon has written sensitive stories including reports about illegal spying by the DAS domestic intelligence agency that led to its dismantling and the jailing of more than 20 agents.

Semana said he is working on a story about cushy conditions for military officers convicted of human rights violations held at a military base near Girardot.