Posted by The interim government in Honduras says it will block any attempt by ousted President Manuel Zelaya to return.
Mr Zelaya, who was removed by troops a week ago, had promised to fly home to the Central American nation later on Sunday.
But Foreign Minister Enrique Ortez said that any plane carrying Mr Zelaya would not be allowed to land.
The stand-off comes a day after the top regional body, the OAS, suspended Honduras over the crisis.
Supporters of the ousted leader were said to be gathering in the capital, Tegucigalpa, in order to meet him at the airport.
The BBC’s Stephen Gibbs, in the capital, says there are growing fears of violence. The capital’s archbishop has warned of a possible “bloodbath”.
“I imagine there’ll be blood and I’m ready for it. We’re not afraid,” Zelaya supporter Marisol Velasquez told AFP.
A heavy troop presence was reported at and around the airport, but the city was said to be calm.
Soldiers arrive at the capital’s main airport
‘Accompany me’
The military – backed by Congress and the courts – forced Mr Zelaya out of Honduras on 28 June over his plans to hold a vote on possible constitutional change.
But his removal has been widely criticised by the international community.
 | CRISIS TIMELINE President Zelaya planned non-binding public consultation on constitutional change Critics say he wanted to stay in power 28 June: Troops seize and expel Zelaya; parliamentary speaker becomes interim leader 29 June: US President Obama condemns the overthrow as illegal 4 July: Organization of American States suspends Honduras in protest at overthrow  |
Mr Zelaya had said he would fly back to the country from Washington, arriving between 1300 and 1400 local time (1900 – 2000GMT).
“I ask all farmers, residents, Indians, young people and all workers’ groups, businessmen and friends… to accompany me on my return to Honduras,” he said in a taped statement sent to media outlets.
He had suggested that he would be accompanied by regional leaders and officials from the Organization of American States.
But early on Sunday, Foreign Minister Enrique Ortez said Manuel Zelaya would not be allowed back in, “come what may”.
“The landing of the plane which will bring the ex-president is banned,” he said, suggesting the decision was made in part for Mr Zelaya’s own safety.
Mr Zelaya is not reported to have left Washington. He was planning a news conference later in the day, AP said.
‘Stay away’
Late on Saturday, the OAS suspended Honduras – the first time the organisation had taken such a measure since Cuba was suspended in 1962, when it allied itself with the USSR.
But the new government in Honduras appears to be standing firm.
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“The OAS is a political organisation, not a court, and it can’t judge us,” interim President Roberto Micheletti said prior to the suspension.
On Saturday supporters of the interim government rallied in the capital waving flags and shouting anti-Zelaya slogans.
Demonstrations so far have been mostly peaceful but correspondents say the country is becoming increasingly polarised.
Tegucigalpa Archbishop Cardinal Oscar Andres Rodriguez has urged Mr Zelaya to stay away to prevent violence.
“We think that a return to the country at the moment could provoke a bloodbath,” he said in a statement broadcast on radio and television.
Mr Zelaya, a wealthy businessman, is a left-wing politician and supporter of Venezuelan President Hugo Chavez.
His opponents, which includes the Supreme Court and a majority in parliament, accuse him of seeking to prolong his rule.
He had wanted to hold a popular vote on convening a constitutional convention – a move that could have removed the current one-term limit for presidents.
Source: BBC