Drones, used for aerial photography, can also carry danger. (Getty Images)

Earlier this month, two unmanned drones carrying 4 pounds of plastic explosives targeted Venezuelan President Nicolas Maduro and his party in an assassination attempt during an outdoor event. The military thwarted the attack, intercepting one of the drones; the other crashed into an apartment building two blocks away.

The concert industry, already jolted by mass killings last year at Ariana Grande’s Manch...

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