The Times Ireland reports that United Kingdom police think a present or former airport employee was behind the incident.
In December, reported drone sightings resulted in a 36-hour shutdown of London's Gatwick airport - the UK's second-largest airport.
Citing "safety reasons", it said that flight operations were suspended "in line with agreed protocols for confirmed drone sightings". But if that's true, and costly drone-mitigation features can be outfoxed by simply hiding behind a shed for a bit, the airports are surely fighting a losing battle in this war on bored men with drones.
"As there were no further drone sighting within the 30-minute suspension period, Dublin Airport resumed flight operations shortly after noon", the airport said in a statement.
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Over 100,000 passengers were affected.
"The safety and security of passengers is always our key priority", said the airport in a tweet.
From 13 March it will be illegal to fly a drone within three miles of an airport, rather than the current 0.6-mile (1km) exclusion zone.
"Three flights were diverted due the suspension of flight operations and there will also be some knock-on delays to flights today".
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After Thursday's incident, Ireland's main opposition party Fianna Fail called for more government action.
Late on Thursday morning, the airport said flights had been suspended.
The National Civil Aviation Threat and Risk Group meeting involved the Garda, Defence Forces, officials from the departments of transport, justice and foreign affairs, the Irish Aviation Authority, and representatives from Ireland's airports and airlines.
"The misuse of drones is an offence, and flying drones in controlled Irish airspace or within 5 kilometres of an airport is a very serious matter".
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