British army bomb disposal experts tonight suspended a search of customs offices in Co Fermanagh where an explosion occurred, police said.
Examinations of the scene at Killyhevlin industrial estate in Enniskillen will resume in the morning.
Police received a telephone warning last night claiming a bomb had been left at the document processing centre for duty and VAT claims.
Witnesses reported seeing windows on the building blown out, but there were no injuries.
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A Customs spokesman said staff have been told they will not be allowed back into the cordoned off offices until late tomorrow.
Police have refused to confirm if the blast was caused by a bomb.
PA