An opponent to Venezuela's President Nicolas Maduro returns a tear gas canister in Caracas, Venezuela, April 30, 2019. (AP Photo/Ariana Cubillos)
Venezuelan opposition leader Juan Guaido, who many nations have recognized as the country's rightful interim ruler, shakes hands with a military member near the Generalisimo Francisco de Miranda Airbase, in Caracas, April 30, 2019. (REUTERS/Carlos Garcia Rawlins)
People react to tear gas near the Generalisimo Francisco de Miranda Airbase in Caracas, April 30, 2019. (REUTERS/Carlos Garcia Rawlins)
Soldiers take a position on an overpass next to La Carlota air base in Caracas, April 30, 2019. Venezuelan opposition leader Juan Guaido has called for a military uprising, in a video shot at the air base showing him surrounded by soldiers and accompanied by detained activist Leopoldo Lopez. (AP Photo/Ariana Cubillos)
A woman suffocated by tear gas is helped by fellow opponents of President Nicolas Maduro outside La Carlota air base in Caracas, April 30, 2019. (AP Photo/Ariana Cubillos)
An uprising member of the Bolivarian National Guard gestures outside La Carlota air base in Caracas, Tuesday, April 30, 2019. (AP Photo/Ariana Cubillos)
Opposition leader Leopoldo Lopez, is greeted by a supporter outside La Carlota air base in Caracas, April 30, 2019. (AP Photo/Ariana Cubillos)
A military vehicle blocks an avenue next to La Carlota air base in Caracas, April 30, 2019. (AP Photo/Ariana Cubillos)
Military personnel loyal to Venezuela's President Nicolas Madura stand inside La Carlota air base in Caracas, April 30, 2019. (AP Photo/Fernando Llano)