Washington: Syrian rebels battling the regime of President Bashar Al Assad have begun receiving significantly more and better weapons in recent weeks, an effort paid for by Gulf nations and coordinated in part by the United States, according to opposition activists and US and foreign officials.

Obama administration officials emphasised that the United States is neither supplying nor funding the lethal material, which includes antitank weaponry.

Instead, they said, the administration has expanded contacts with opposition military forces to provide the Gulf nations with assessments of rebel credibility and command-and-control infrastructure.

"We are increasing our non-lethal assistance to the Syrian opposition, and we continue to coordinate our efforts with friends and allies in the region and beyond in order to have the biggest impact on what we are collectively doing," said a senior State Department official, one of several US and foreign government officials who discussed the evolving effort on the condition of anonymity.

The US contacts with the rebel military and the information-sharing with Gulf nations mark a shift in Obama administration policy as hopes dim for a political solution to the Syrian crisis.

Flow of weapons

Many officials now consider an expanding military confrontation to be inevitable. Material is being stockpiled in Damascus, in Idlib near the Turkish border and in Zabadani on the Lebanese border.

Opposition activists who two months ago said the rebels were running out of ammunition said this week that the flow of weapons — most still bought on the black market in neighbouring countries or from elements of the Syrian military — has significantly increased after a decision by Saudi Arabia, Qatar and other Gulf states to provide millions of dollars in funding each month.

Syria's Muslim Brotherhood also said it has opened its own supply channel to the rebels, using resources from wealthy private individuals and money from Gulf states, including Saudi Arabia and Qatar, said Mulham Al Drobi, a member of the Brotherhood's executive committee.

The new supplies reversed months of setbacks for the rebels that forced them to withdraw from their stronghold in the Baba Amr neighbourhood of Homs and many other areas in Idlib and elsewhere.

"Large shipments have got through," another opposition figure said. "Some areas are loaded with weapons."