By ANGELA CHARLTON and ANDRES GUTIERREZ 07/03/13 01:14 PM ET EDT

 LAS PALMAS, Canary Islands — Bolivia's president left Europe for home on Wednesday in a diplomatic drama after his flight was rerouted and delayed overnight in Austria, allegedly because of suspicions he was trying to spirit NSA leaker Edward Snowden to Latin America.

Bolivia accused the United States of ordering European countries to block President Evo Morales' flight from their airspace, and accused European governments of "aggression" by thwarting the flight.

However it's still unclear whether European countries did block the plane and, if so, why. French, Spanish and Portuguese officials all said Wednesday the plane was allowed to cross their territory.

Snowden himself remains out of public view, believed to be stuck in a Moscow airport transit area, seeking asylum from one of more than a dozen countries.

Bolivia's president sparked speculation that he might try to help Snowden get out during a visit to Russia after he said that his country would be willing to consider granting him asylum.

The plane carrying Morales home from a Moscow summit was rerouted to Vienna on Tuesday night, adding a new twist to the international uproar over Snowden's revelations of widespread U.S. surveillance. The plane took off again shortly before noon Wednesday after sitting overnight at the airport.

The emergency stop in Austria may have been caused by a dispute over where the plane could refuel and whether European authorities could inspect it for signs of Snowden.

Austrian officials said Morales' plane was searched early Wednesday by Austrian border police after Morales gave permission. Bolivian and Austrian officials both say Snowden was not on board.

Morales' aircraft asked controllers at Vienna airport to land because there was "no clear indication" that the plane had enough fuel to continue on its journey, an official in Vienna said. The official demanded anonymity because he was not authorized to go public with the information.