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Authorities in Guatemala are holding a member of a U.N.-sponsored anti-corruption commission in the capital's airport, refusing him entry to the country in an escalation of tensions between the government and the commission.

Colombian national Yilen Osorio was detained by Guatemalan immigration officials upon arrival at the airport Saturday afternoon. The move comes despite a court ruling that Guatemala must grant visas and entry to members of the commission, which has investigated top members of Guatemala's government, including President Jimmy Morales and his brother. They deny accusations of corruption

Osorio heads an investigation of alleged bribery implicating the vice president of congress and others.

There was no immediate comment from Guatemala's government.

During 11 years in Guatemala, the commissionhas pressed corruption cases that have implicated more than 600 people.