The Israeli military says it has attacked several targets in the border area between Lebanon and Syria.
The Israeli military said it had attacked infrastructure used by Lebanese Shiite Hezbollah militias along the Lebanese-Syrian border, particularly the routes Hezbollah used to smuggle weapons into Lebanon via Syria.
Since Israel intensified attacks in Lebanon on Monday, four border crossings have been hit, Lebanese security sources said.
The Syrian Observatory for Human Rights, which has been documenting violence in Syria since 2011, reported that Israeli warplanes attacked a border crossing near the Syrian town of al-Qusayr, near the border with Lebanon.
According to the war observer, several people were injured.
It is the first Israeli attack on Syrian territory since Israel stepped up its attacks on Lebanon on Monday, the observatory said.
According to information from the war monitor, Hezbollah tried to use the border crossings to bring more fighters into the country from Yemen and Iraq.
They would come to the country to support the Shiite militias in the event of a feared ground attack by the Israeli army, the report said.