Armed men dressed in military uniforms entered a luxurious ranch Tuesday and opened fire on people playing soccer, killing at least 16 in what appeared to be a confrontation between two warring cocaine cartels, officials said.

The massacre took place on a ranch in an area called Candelaria, 12 miles east of the city of Cali, police said.A dozen men arrived in two vehicles and began shooting "anything that moved," said a police spokesman in Cali.