President Gloria Macapagal Arroyo won a narrow victory over her movie star rival in the May 10 vote, according to an unofficial tally, national election officials said Monday, although her opponent claimed massive fraud and warned of a "people power" revolt.

Arroyo put the military on full alert to prevent the vote count from being influenced by "mob rule," her spokesman said.

Arroyo led with 39.5 percent of the vote to Fernando Poe Jr.'s 36.6 percent, election officials said. The margin of Arroyo's lead was more than 900,000 votes.

Ballots in two areas -- Sarangani province and Cotabato city -- remain to be counted, but they do not represent enough votes to affect the outcome, the officials said.

An official hand count will not be finished for weeks. But two top election officials, speaking on condition of anonymity, said an unofficial count was made during the tabulation for senatorial candidates. Results of the Senate races were released Monday by the Commission on Elections.

Referring to Arroyo's victory, one election official said, "It's clear, but Congress is the one who will proclaim that."

Benjamin Abalos, the Elections Commission chairman, said he and other officials counting the votes for senatorial candidates also tracked presidential votes appearing in the same documents. However, the officials could not announce their tally publicly, he said.

Arroyo also was leading Poe by more than 730,000 votes in a government-sanctioned, but unofficial, "quick count" by an election watchdog. It has tallied more than 60 percent of 216,000 election precincts.

The size of Arroyo's advantage may do little to ease growing tensions. Poe's supporters assert that their own count shows a clear victory for him.

Under the constitution, Congress must tally the votes for president and vice president from regional and provincial vote totals. Lawmakers then proclaim the winner.

Police warned that they would disperse illegal rallies.

"We will not allow this vital institutional process to be sabotaged, subverted or delayed in any manner by lawless machinations or mob rule," Arroyo's spokesman, Ignacio Bunye, said in a statement.