The Free Syrian Army was involved in two-week training programmes that included work with anti-tank and anti-aircraft weapons, a US official and a Syrian rebel commander told the Times.
White House spokesman Jay Carney would not comment on the report and also declined to outline what weapons the US could provide to the rebels, except to say "I cannot inventory for you all the elements of that assistance."
"The important point here is that, because of the actions we have seen the Assad regime take, we have decided to increase both the scope and scale of our assistance to the opposition, and we've been very clear about that over the last weeks and months," he said.


Syrian rebels say they have received new types of arms
Syrian rebels have recently received new weapons that could "change the course of the battle" against the Syrian regime, a spokesman for the Free Syrian Army told AFP on Friday.
"We've received quantities of new types of weapons, including some that we asked for and that we believe will change the course of the battle on the ground," FSA political and media coordinator Louay Muqdad said.
"We have begun distributing them on the front lines, they will be in the hands of professional officers and FSA fighters," he said.
He did not specify what weapons had been received or when they had arrived, but added that a new shipment was expecting in coming days and recalled that the rebels had asked for "deterrent weapons."
The apparent influx of weapons comes after the United States said it would provide rebel forces with "military support," although it has declined to outline what that might entail.
"The weapons will be used for one objective, which is to fight the regime of (President) Bashar al-Assad," Muqdad insisted."They will be collected after the fall of the regime, we have made this committment to the friends and brotherly countries" who supplied the weapons, he said.
On Thursday, Muqdad said rebels needed short-range ground-to-air missiles, surface-to-air missiles known as MANPADS, anti-tank missiles, mortars and ammunition.