Colombia ramped up a war of words with Venezuela and Ecuador on Tuesday, with President Álvaro Uribe pledging to denounce Venezuela’s Hugo Chávez in international courts for “sponsoring and financing genocide”.

Colombia’s vice-president Francisco Santos also accused the country’s Farc rebels of planning to make a radioactive “dirty bomb”, citing information from computers reported captured during Colombia’s raid on a guerrilla jungle camp over the Ecuadorian border. Senior Farc commander Raúl Reyes was killed during Saturday’s raid. The accusations, together with Colombia’s claims that the governments of Ecuador and Venezuela have had direct links with the Marxist insurgents, followed the decision by both Venezuela and Ecuador to send troops to their borders and sever diplomatic ties with Bogotá.