Leftist guerrillas were holding four Americans and an Italian kidnapped at a roadblock on a highway south of the capital, their leader said Thursday. The government said at least 30 people were taken hostage.
The Americans -- three men and a woman -- were on a bird-watching trip when the rebels captured them Monday about 35 miles south of Bogota. The Italian was in a separate car.
"We have four Americans, and we have an Italian," said Commander Romana, the local leader of the Revolutionary Armed Forces of Colombia, the country's largest rebel group.
In a local television interview, Romana issued no demands for the foreigners' release. Foreigners are a prime kidnapping target because they fetch the highest ransoms. Radio reports identified the Americans as Peter Shen, Todd Richardson, Lois Agustino and Thomas Fiore.
Shen is from New York City, a source close to the investigation said. The hometowns of the others were not known.