(Adds Clinton comments, death toll, Algerian minister)
* Disillusioned Arab monitor says others have also quit
* Arab League split over troubled monitoring mission
* Accusations fly over French reporter's death in Homs
By Alistair Lyon
BEIRUT, Jan 12 (Reuters) - Several Arab League monitors have left Syria or may do so soon because the mission has failed to halt President Bashar al-Assad's violent crackdown on a popular revolt against his rule, an Algerian former monitor said on Thursday.
Syrian opposition groups say the monitors, who deployed on Dec. 26 to check whether Syria was respecting an Arab peace plan, have only bought Assad more time to crush protests that erupted in March, inspired by Arab uprisings elsewhere.
The observers resumed work on Thursday, a League official said, for the first time since 11 of them were injured by pro-Assad demonstrators in the port of Latakia three days ago, an attack which also sidelined plans to expand the team.
Anwar Malek, an Algerian who quit the monitoring team this week, said many of his former colleagues shared his chagrin.
"I cannot specify a number, but many. When you talk to them their anger is clear," he told Reuters by telephone, adding that many could not leave because of orders from their governments.
He said a Moroccan legal specialist, an aid worker from Djibouti and an Egyptian had also left the mission.
Their departures could not immediately be confirmed. But another monitor, who asked not to be named, told Reuters he planned to leave Syria on Friday. "The mission does not serve the citizens," he said. "It doesn't serve anything."
Arab League Secretary-General Nabil Elaraby said Syria had only implemented parts of the agreement it had signed. "Neither the violence has stopped, nor the killing. The level has dropped, but it has not stopped," he told al-Hayat television.
The British-based Syrian Observatory for Human Rights said at least 21 people were killed across the country on Thursday. Seven died in the eastern city of Deir al-Zor when security forces opened fire and the bodies of seven security force members were delivered to a hospital in the town of Maarat al-Noman, apparently killed in clashes with army deserters.
The Arab League, which will hear a full report from the monitors on Jan. 19, is divided over Syria, with Qatar its most vocal critic and Algeria defending steps taken by Damascus.
The mission, the first of its kind the League has mounted, is led by Sudanese General Mohammed al-Dabi, who has come under fire from rights groups over his role in the Darfur conflict.
"ASSAULT ON OWN PEOPLE"
U.S. Secretary of State Hillary Clinton, speaking after talks in Washington with Algeria's Foreign Minister Mourad Medelci, stressed "the need to end the Assad government's assault on its own people".
Medelci, who had earlier said that the Assad government had taken steps to defuse the crisis, said he and Clinton had a "concurrence of views".
Assad, breaking a six-month public silence on Tuesday, disparaged the Arab League, which suspended Syria in November over its bloody handling of the unrest. He blamed the upheaval on "terrorists" whom he would punish with an iron fist.
The conflict in Syria, in which insurgents have joined what began as a mostly peaceful movement to end 41 years of Assad family rule, has killed more than 5,000 people, by a U.N. tally. The government says 2,000 soldiers and police have been killed.
A French journalist, Gilles Jacquier, was among nine people killed in the rebellious city of Homs on Wednesday in what the state news agency SANA said was a mortar attack by "terrorists".
Jacquier, the first Western reporter killed in Syria in 10 months of unrest, was in a government-escorted media group visiting a pro-Assad neighbourhood of the divided city, which has been racked by protests, crackdowns and sectarian violence.
As with three deadly explosions in Damascus in the past few weeks, Assad's critics have suggested the authorities staged the Homs attack to reinforce their argument that Syria is facing foreign-backed militants, not a broad pro-democracy revolt.
"This killing is indicative of the transition of the Syrian regime from preventing press from freely working and covering the events in Syria to killing journalists and media personnel, in an attempt to silence neutral and independent media sources," the opposition Syrian National Council said in a statement.
Syrian border guards turned away a protest convoy of about 150 Syrian expatriates from Europe, North America and the Arab world on Thursday who were trying to enter the country to draw attention to civilians caught up in the unrest.
Malek's withering public criticism dealt a further blow to a mission that the Syrians had long resisted.
"I resigned from the monitoring mission when it reached a dead end and I became certain that I was serving the Syrian regime, (which) was exploiting us for propaganda," he said.
Malek, who is now in Qatar, said violence by security forces had continued unabated during his stay in Homs. "We were giving them cover to carry out the most repugnant actions, worse than was taking place before the monitors came," he said.
General Mohammed al-Dabi, speaking to reporters in Damascus, denied Malek's comments, saying the Algerian monitor had stayed in his hotel in the city of Homs for six days, refusing to work. Malek said he stopped working last Friday after posting criticism of the mission on his Facebook page.
Qatari Prime Minister Sheikh Hamad bin Jassim al-Thani, who heads the Arab League committee on Syria, said doubts were growing about the effectiveness of the monitors.
"I could not see up until now a successful mission, frankly speaking," he told a joint news conference with Clinton in Washington. "We hope we solve it, as we say, in the house of the Arabs, but right now the Syrian government is not helping us."
However, Algerian Foreign Minister Mourad Medelci said Assad's government had taken some actions to defuse the crisis, citing a withdrawal of heavy weapons from cities, the release of a few thousand prisoners and an opening up of the media.
He acknowledged that all of these were incomplete responses to the terms of the Arab peace plan, but said it was the taking up of arms by the opposition that threatened wider violence.
"The feeling is that the government of Syria is in the process of making more of an effort, but the Arab League is especially having problems with the armed opposition," he said.
Any admission that the monitoring mission has failed will pile pressure on the Arab League to refer Syria to the U.N. Security Council, although a Western diplomat there said Algeria, Iraq and Egypt were likely to oppose such a step.
Western powers say Russia, a long-standing ally of Damascus, has blocked any tough moves by the council against Damascus and only a direct appeal by the league could shift Moscow's view. (Additional reporting by Dominic Evans in Beirut, Lin Noueihed in Cairo, Regan Doherty in Doha, Patrick Worsnip at the United Nations and Arshad Mohammed and; Andrew Quinn in Washington; Editing by Myra MacDonald)