U.S. Secretary of State John Kerry says no decision has yet been made on how the United States will help opposition fighters "save Syria."
Kerry spoke Wednesday in Washington alongside British Foreign Secretary William Hague, as London and Washington press for strategies to end Syria's civil war and establish a transitional government.
Hague said Britain and its allies must do more to save innocent lives in Syria, and he said the situation demands what he called a "strong and determined" approach by London, Washington and other Western allies.
Both Britain and the United States have provided non-lethal support to rebels opposed to Syria's President Bashar al-Assad, and have discussed the possibility of sending weapons.
But neither government has yet sent arms to rebel forces, in part because of fears that such hardware could fall into the hands of Sunni extremists who have joined the fight to oust President Assad and his government.
For their part, moderate rebel leaders argue that Western inaction is undermining their leadership and will allow al-Qaida-linked militants to rise to the forefront of the two-year rebellion.
Opposition leaders renewed calls for Western arms after the fall of Qusair,a key western town near the Lebanon border. The town fell June 5, after Iranian-backed Hezbollah militants based in Lebanon crossed the border to join forces with Syrian government fighters.
Analysts say as many as 5,000 Hezbollah fighters are in Syria, alongside pro-Assad forces who are poised to attack the strategic town of Homs.