The Washington Post cited Arab and militant officials as saying on Sunday.
The officials, however, declined to disclose the name of the foreign countries supplying the armaments, the first heavy weapons, according to the report, supplied by foreign powers to militants so far.
Saudi Arabia, Qatar, the US and its major European allies, Turkey and the United Arab Emirates are some of the major supporters of the militants in Syria.
The new influx of weapons supplied to the militants in Syria was first publicized this month by British blogger Eliot Higgins, alias Brown Moses, who tracks the militants’ activities by watching their videos on YouTube.
Higgins witnessed the militants’ use of new weapons, including M-79 anti-tank weapons and M-60 recoilless. He noted that the Syrian government does not possess such weapons and the armaments must have been supplied by foreign countries.
The Syria crisis began in mid-March 2011. Many people, including large numbers of security personnel, have been killed in the violence, and several international human rights organizations say the foreign-sponsored militants have committed war crimes.
The Syrian government says the chaos is being orchestrated from outside the country, and there are reports that a very large number of the militants fighting the Syrian government are foreign nationals.
The foreign-backed militants in Syria have reportedly been supplied with a large new consignment of weapons, including heavy armaments, over the recent weeks.
The new armaments, including anti-tank weapons and recoilless rifles, have been sent across the Jordanian border into the southwestern Governorate of Daraa,