BEIRUT — Regional security officials say Israel conducted an airstrike inside Syria overnight near the border with Lebanon.

The two officials did not say what the target was. But they said Wednesday that Israel had been making plans in the days leading up to the airstrike to hit a shipment of weapons bound for the anti-Israel militant group Hezbollah in Lebanon.

They said the shipment included sophisticated, Russian-made SA-17 anti-aircraft missiles, which would be strategically "game-changing" in the hands of Hezbollah.