An ambush by leftist rebels has left 28 soldiers dead in the deadliest assault on Colombian government troops in years, authorities said late on Tuesday.
Initial reports by several military officials indicated the soldiers were protecting government workers during a coca eradication effort when the Revolutionary Armed Forces of Colombia, or FARC, surprised them on Tuesday morning.
But in a press conference on Tuesday night in Bogota, Defense Minister Camilo Ospina said the workers eradicating coca -- the source of cocaine -- completed their task nine days ago and left the region.
The troops, however, remained in the area to provide security to civilians who were being threatened by the FARC, which controls cocaine production in the area, he said.
The fighting took place just outside the Sierra Macarena National Park, a pristine reserve where the country's central grasslands meet the Amazon jungle, he said.
The main town in the remote area is Granada, 130km south of Bogota.
Some 400 FARC rebels took part in the attack, outgunning about 80 troops with the army's 12th Mobile Brigade, brigade commander Colonel Carlos Ramirez said.
At least five other soldiers were injured, three seriously, the Colombian Army said. One more soldier remains unaccounted for and may have been kidnapped, said the minister.
A photographer in Vista Hermosa saw at least four injured government troops being loaded on to helicopters to be taken to nearby hospitals.
The Defense Ministry, in a statement, said an operation had been launched to pursue the attackers.
Since the beginning of the year, more than 600 government forces, including military and police, have been killed by the FARC or other illegal, armed groups, according to government statistics.
In June, several hundred FARC fighters launched an assault against a small military base in southern Putumayo, killing 22 soldiers. And in February, the FARC used homemade rockets to attack a marine outpost on the Iscuande River in southwest Colombia, killing 16 marines.
The FARC, which funds itself mainly through drug trafficking and kidnapping, is considered a terrorist organization by the US and the EU. Colombia is the world's leading producer of cocaine, and supplies up to 90 percent of the US market.
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