According to the irish Independent should a pilot have seen a drone 11.30 local time. It is unclear how many drones it should have been.

the Airport announced in a post on Twitter that they closed the airport, but only a quarter of an hour after the first message if the close down tweeted the airport again and notice that the business had been resumed.

https://twitter.com/DublinAirport/status/1098554129629229056