Football fans have been left confused after a drone caused a lengthy delay to the Premier League fixture between Brentford and Wolves on Saturday afternoon.
Referee Peter Bakes called a halt to the first-half proceedings and ordered both sets of players to leave the pitch after the flying object was spotted above the Brentford Community Stadium.
It then took 20 minutes for the incident to be resolved before play could be resumed.
Many supporters both in the ground and on social media questioned the suspension of the match.
But a report put together by John Newsham for The Football Safety Officers Association explains why drones are banned from football stadiums.
There are two main safety reasons given for why a match must be stopped while one is overhead.
The first is simply that if the pilot loses control of the device, then it could fall and injure either a player or a crowd member.
And the other is the "potential for terrorist activity", with the drone possibly weaponised with explosives or poisonous gases.
Do you agree with the reasoning? Let us know in the comments section.
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There is also the concern that the person behind the drone could be illegally broadcasting or recording the sporting event in question.
A man was fined in 2015 for flying drones over Premier League stadiums.
Nigel Wilson, from Bingham, Nottinghamshire, was originally accused of 17 breaches of the Air Navigation Order but eventually admitted nine cases.
His offences took place at both football grounds and tourist attractions in 2014.
Wilson was fined £1,800 in what was the first case in England of a person being prosecuted for using drones after a police-led operation.
He'd captured footage at Anfield during a Liverpool European match, at the Emirates during a north London derby between Arsenal and Tottenham, and at the Etihad when Man City faced Spurs.
