NEW : In remarks broadcast on state television , Maduro called the situation `` a serious offense . '' A State Department official says the plane was approved to enter U.S. airspace . Venezuelan officials say the U.S. denied airspace access to their presidential plane . Venezuela 's president says the U.S. also denied U.N. delegation visas . Maduro called the move a ` ` serious offense ''
NEW : A State Department official says the plane was approved to enter U.S. airspace . Venezuelan officials say the U.S. denied airspace access to their presidential plane . Venezuela 's president says the U.S. also denied U.N. delegation visas . Maduro called the move a ` ` serious offense ''