A suspect device was found at a central Dublin hotel late last night.
Gardai at Store Street are investigating the discovery in the doorway of the Clifton Court hotel on Eden Quay.
They responded to a call at 11.15pm and located the located the device immediately. The area was sealed off and the hotel evacuated.
The Army's Explosive Ordinance Disposal team was called and a controlled explosion was carried out.
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Further tests are expected to be carried out on the device this morning.
"No arrests were made and investigations are ongoing," a Garda spokeswoman said.
Anyone with information are asked to contact Gardaí at Store Street on 01 6668000 or the Garda Confidential Line on 1800 666 111, or any Garda Station.