Yemen's president and opposition agreed on Wednesday, May 18, to sign a Gulf-brokered deal for a transition of power with slight modifications after intervention from U.S. and European diplomats, an opposition official said.

The deal, which the opposition said would be signed later on Wednesday, would ease entrenched President Ali Abdullah Saleh out of power within a month after a nearly 33-year rule in the impoverished Arabian Peninsula state.

"After American, European and Gulf efforts, there was agreement by the president on the Gulf initiative after simple changes, and the signing will be today," opposition official Yahya Abu Usbua said.

Al Arabiya television quoted an adviser to the Yemeni president as confirming the signing would take place on Wednesday.

The opposition, whose coalition includes Islamists and leftists, said that among the minor modifications in the deal were changes in who would sign and in what capacity for the opposition and for the government.

"The president will sign for the government in his capacity as president of the republic and as head of the ruling party," Abu Usbua said, Reuters reported.