Two former Guatemalan ministers have been arrested as part of a major investigation led by a United Nations-backed commission.have been accused of using public funds to buy a helicopter that was given as a gift to former President Otto Perez Molina. He was arrested in September after standing down amid widespread anti-corruption protests. Mr Perez Molina denies all the charges Mr Lopez Ambrosio served as defence minister and Mr Lopez Bonilla as interior minister in Mr Perez Molina's government.