Israel has informed the United States that Lebanese Hezbollah fighters in Syria are using U.S. armored personnel carriers originally supplied to the Lebanese Army, a senior Israeli military officer said on Wednesday.

The U.S. State Department said last month that the American embassy in Beirut was working to investigate images on social media purporting to show Hezbollah, which supports President Bashar al-Assad, displaying U.S. military equipment in Syria.

Those images were widely reported to have been of U.S.-made M113 armored personnel carriers, which the State Department said were extremely common in the region.

In an intelligence briefing to foreign reporters in Tel Aviv, the senior officer showed a photograph of military vehicles, which he said included U.S.-made armored personnel carriers (APCs), along a road.

"These APCs are of the Hezbollah, while fighting in Syria, that they took from the Lebanese armed forces," he said in English, describing the guerrilla group as dominant in Lebanon.

"We shared this information with other countries, including the U.S. of course, and I can even say that we recognized these specific APCs with some specific parameters that we know ... these were given to the Lebanese armed forces. It's not an assumption," said the officer, who under the rules of the briefing could not be identified by name, rank or position.

Western diplomatic sources have said the APCs were delivered to the Lebanese Army by the United States as part of a program to equip that force.

The officer made no comment about when the APCs would have been supplied to the Lebanese Army.