11.   But the caller used no established codeword to authenticate the claim.

12.   Callers use a special number to leave a voice message, and it pops up as an e-mail.

13.   But with the new technology, a caller could use a cell phone in parts of the world that use different standards than the United States.

14.   No bombs were found and no one claimed responsibility, although the callers used recognized Irish Republican Army code words.

15.   Some threatened to kill Arabs and Muslims, and one said the caller was using the Koran, the Islamic holy book, for toilet paper, Mehdi said.

16.   The call was believed to be genuine since the caller used a pre-arranged code.

17.   The caller used a recognized code word, RTE said.

18.   The callers did not use a code word, police said.

19.   The caller used a recognized IRA code-word, RTE said.

20.   The police could not say if the caller used a recognised codeword used by paramilitaries.