Interpol will report Thursday that Colombia did not tamper with computers it says it seized during an attack on a leftist rebel camp, security officials said.

The computers contain a trove of files suggesting Venezuela’s Hugo Chavez tried to arm and finance the guerrillas. Venezuela denies any such aid and claims Colombia faked the computer evidence.

The security officials, who spoke only on condition of anonymity because the report wasn’t public yet, said the forensic study would say Colombia did not tamper with the files.

Such a conclusion would increase pressure on Venezuela’s socialist government to explain the evidence of its close cooperation with the Revolutionary Armed Forces of Colombia, or FARC.

Colombia said its commandos recovered the computers from the rubble of a rebel camp across the border in Ecuador destroyed March 1 by Colombian forces. FARC foreign minister Raul Reyes and 24 others were killed in the raid.

Chavez has called the documents fakes, consistently referring to “the supposed computer of Raul Reyes.” He denies arming or funding the FARC, though he openly sympathizes with Latin America’s most powerful rebel army.

Colombia turned to Interpol in hopes of dispeling doubts about the authenticity of documents on the three laptops, two external hard drives and three USB memory sticks.

The forensic exam was limited to verifying whether Colombia had altered the files and correctly handled the evidence. Interpol was not asked to analyze the contents of electronic documents themselves.

The most damning evidence to date against Chavez came in text files shown to The Associated Press last week by a senior Colombian official.

More than a dozen internal rebel messages detail several years of close cooperation between top officials in Venezuela’s government and military with the FARC, including rebel training facilities on Venezuelan soil.

They also suggest Venezuela was preparing to loan the rebels at least US$250 million (euro190 million), provide them with Russian weapons and possibly even help them obtain surface-to-air missiles for use against Colombian military aircraft.