A drone owner had their aircraft confiscated after they tried to fly it during the Wales Airshow.
The two-day airshow attracted hundreds of thousands to the city - with highlights including the Red Arrows, a Eurofighter Typhoon, the Battle of Britain Memorial Flight and a Chinook helicopter
But police were called to Victoria Park, Swansea at around 1.10pm on Saturday - one of the busiest times of the event - after receiving reports of a drone being in use.
Ahead of the weekend, a six-mile no fly-zone had been imposed - and organisers had flagged up that it was there too.
Guidance published before the event said: "Drones are becoming increasingly popular and accessible, but they are strictly prohibited during the Wales Airshow. This includes both professional and recreational use."
It said the event would be taking place within restricted airspace and using drones was against the law.
Users would be investigated and prosecuted by the Civil Aviation Authority, the statement continued.
Witnesses reported seeing a drone flying at around 100ft above the crowds while the show was ongoing.
Robert Fisher, a chartered surveyor who regularly uses a drone, called it "extremely dangerous".
He said: "You're not allowed to fly within 50m of a person and the airshow had a six mile exclusion zone around it.
"Flying it down there is extremely dangerous and the trouble is that anyone can buy a drone.
"It's not like getting a slap on the wrist, these laws are civil aviation laws.
"It beggars belief because you wouldn't be able to fly there on a normal day because you need the permission of the land owner."
The incident comes just months after hundreds of flights were cancelled at Gatwick Airport in December last year following reports of drone sightings close to the runway.
Major disruption was caused, affecting around 140,000 passengers and 1,000 flights - leading to the biggest disruption to flights since ash was released from an Icelandic volcano in 2010.
A South Wales Police spokesman said of the latest incident: "We did confiscate a drone from a person in Victoria Park at about 1.10pm on Saturday."
He added that the aircraft was returned to its owner earlier today.
It is believed no further action was taken.
