US drones are monitoring “the Syrian military attacks against opposition forces and civilians,” NBC News reported citing unnamed US defense officials.
According to the report, Washington hopes to use the overhead evidence and communications to make a case for widespread international response against Syria.
The White House, the State Department and the Pentagon have lately discussed possible humanitarian missions in Syria, NBC News said.
The report added that such missions would almost be impossible without US military intervention.
Syria has been experiencing unrest since mid-March last year.
On Thursday, the UN General Assembly adopted an Arab League-sponsored resolution on Syria for what it calls the government's crackdown on opposition protests.
The Syrian ambassador to the UN Bashar al-Jaafari dismissed the resolution as biased and unbalanced.