The US Federal Aviation Administration (FAA) on Tuesday evening issued an order prohibiting US air operators from flying below 26,000 feet in Venezuela's airspace until further notice, citing “increasing political instability and tensions”.

The FAA notice said that any air operators in Venezuela, including private jets, should depart within 48 hours.

Venezuelan opposition leader Juan Guaido made his strongest call to the military to help him oust President Nicolas Maduro but there were no concrete signs of defection from the armed forces leadership.

American Airlines Group Inc in March said it was indefinitely suspending its flights to Venezuela, as the country continued to struggle with political turmoil and unrest.

OPSGROUP, which provides safety guidance to air operators, said options for those choosing to avoid Venezuelan airspace would include routes west via Colombia, or east via Guyana.

“The (FAA) order comes on a day of an information battle waged between Maduro and Guaido, and although the coup status is uncertain, one thing is clear: taking your aircraft to Venezuela is not a good idea,” OPSGROUP said on its website.

Flight tracking service FlightRadar24 showed some flights between South America and Europe were crossing Venezuelan airspace, but at altitudes above 26,000 feet.

Early on Tuesday, several dozen armed troops accompanying Guaido clashed with soldiers supporting Maduro at a rally in Caracas, and large anti-government protests in the streets turned violent.

Venezuelans were expected to again take to the streets on Wednesday for what Guaido pledged would be the “largest march” in the country's history.

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