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Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP) (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP)        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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Venezuelan President Nicolas Maduro delivers a speech during a ceremony to celebrate the 81st anniversary of the National Guard in Caracas on August 4, 2018. - Maduro was unharmed after an exploding drone "attack", the minister of communication Jorge Rodriguez said following the incident, which saw uniformed military members break ranks and scatter after a loud bang interrupted the leader's remarks and caused him to look to the sky, according to images broadcast on state television. (Photo by Juan BARRETO / AFP) (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Venezuelan President Nicolas Maduro delivers a speech during a ceremony to celebrate the 81st anniversary of the National Guard in Caracas on August 4, 2018. - Maduro was unharmed after an exploding drone "attack", the minister of communication Jorge Rodriguez said following the incident, which saw uniformed military members break ranks and scatter after a loud bang interrupted the leader's remarks and caused him to look to the sky, according to images broadcast on state television. (Photo by Juan BARRETO / AFP)        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP) (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP)        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP) (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas on August 4, 201 - Venezuelan President Nicolas Maduro was unharmed after an exploding drone "attack" interrupted his speech at a military ceremony, the minister of communication Jorge Rodriguez said following the incident. (Photo by Juan BARRETO / AFP)        (Photo credit should read JUAN BARRETO/AFP/Getty Images)

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CARACAS, VENEZUELA - AUGUST 4: Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas, Venezuela on August 4, 2018. The attack was carried out by explosive drones targeted Venezuelan President Maduro while he was giving a speech in the capital Caracas. It is reported that 7 soldiers injured, Nicolas Maduro was unharmed in the attack. (Photo by Stringer/Anadolu Agency/Getty Images)

CARACAS, VENEZUELA - AUGUST 4: Security forces check a nearby building after an explosion was heard while Venezuelan President Nicolas Maduro was attending a ceremony to celebrate the 81st anniversary of the National Guard, in Caracas, Venezuela on August 4, 2018. The attack was carried out by explosive drones targeted Venezuelan President Maduro while he was giving a speech in the capital Caracas. It is reported that 7 soldiers injured, Nicolas Maduro was unharmed in the attack. 

 (Photo by Stringer/Anadolu Agency/Getty Images)