"The charge that certain security authorities have hacked the website and meddled in its work are utterly groundless," an official source was quoted as saying by the state-run news agency Petra.

"The authorities did not receive any complaint in this respect and will conduct an investigation in case it receives such a request," he added.

Ammon said Monday its website was sabotaged by "security authorities" and called for a protest in front of the Jordan Journalists Syndicate to condemn the move.

An hour later, the service returned to normal, but the letter to the king disappeared from the website

The message, which was signed by 36 tribesmen, urged the monarch to introduce serious reforms, dissolve both houses of Parliament, set up a national government and put corrupts on trial.

"The flood of Tunisia and Egypt will reach Jordan sooner or later, whether we want it or do not," said the signatories, who belonged to native Jordanian tribes which so far formed the mainstay of the country's Hashemite regime.