Downing Street last night issued details of the exact warnings given before Saturday's Omagh blast, to disprove `Real IRA' claims that they were accurate.
The warnings were received by Ulster Television and the Samaritans and passed on to the RUC.
All three calls used recognised code-words used by the `Real IRA', a spokesman for No 10 said.
At 1432 on Saturday a warning was telephoned to Ulster TV. The exact words used were: "There's a bomb, courthouse, Omagh, main street, 500lb, explosion 30 minutes."
One minute later, at 1433, Ulster TV received a second call. The caller said: "Bomb, Omagh town, 15 minutes."
Another minute elapsed before the third call, at 1434, to the Samaritans at Coleraine.
The caller said: "Am I through to Omagh? This is a bomb warning. It's going to go off in 30 minutes."
The caller then went on to say the bomb was on Main Street about 200 yards from the courthouse. No description of any vehicle was given, Downing Street said.