The Colombian Minister of Defense Juan Manuel Santos denied that Colombian troops entered neighboring Venezuela on Friday.

Venezuela made an official complaint to the Bogotá government, claiming around sixty Colombian soldiers penetrated 800 meters into the border region in the southern state of Aoure. Tensions between the two countries increased sharply in recent weeks, after Colombian troops attacked a FARC camp in Ecuador and confiscated three laptops in March. As documents proving support from Venezuela and Ecuador were found on the computers, Venezuelan President Hugo Chavez has some explaining to do, U.S. officials said.

“President Chavez has a lot of explaining to do,” White House drug czar John Walters told Colombian newspaper El Tiempo in an interview, quoted by Reuters. “They were fluid contacts from both sides. This is a group that wants to violently overthrow a democratic government. This is very serious and requires more than just a simple denial,” he added. Walters also added that the U.S. government did not take a decision on whether to include Venezuela in its list of state sponsors of terrorism.

Interpol confirmed Thursday the authenticity of the 38,000 computer files seized from Revolutionary Armed Forces of Colombia (FARC), AFP reports. The Bogotá government said the data proves that FARC is “financed and armed by Venezuelan President Hugo Chavez.”

However, Chavez dismissed the Interpol report as a “clown show” that “doesn't deserve serious comment.”