On Friday, more than 60,000 people packed into Rio’s Maracanã stadium for the opening ceremony of the 2016 Olympic Games — but above their heads, something disconcerting was happening.
Observers reported as many as three drones hovering above the stadium, triggering a security panic that reached all the way to the teams providing protection for visiting heads of state.
Despite the latest equipment and months of preparation, keeping drones out of an open-air stadium is still an extremely difficult job.
The country has partnered with drone manufacturers like DJI to update the onboard software with Olympic geofences, preventing drones from flying in the forbidden areas. But not every manufacturer has taken up the self-imposed limits, so to stop other drones, the Brazilian military has purchased new devices to jam drone-control signals in mid-flight.