Israeli air raids overnight on Syrian military facilities killed at least 10 government troops, an activist group said.
The Israeli military said it hit nine targets early today inside Syria. The air strikes were in response to a cross-border attack the previous day that killed an Israeli teenager.
In that attack, an Israeli civilian vehicle was struck in the Israeli-controlled Golan Heights, killing the boy and wounding two others in the first deadly incident along the volatile Israeli-Syrian front since Syria's civil war erupted more than three years ago.
The director of the Britain-based Syrian Observatory for Human Rights, Rami Abdurrahman, said the nine Israeli strikes hit seven different Syrian military bases.
He said the air raids destroyed two tanks, two artillery batteries and the headquarters of Syria's 90th brigade.
The Observatory collects its information through a network of activists inside Syria.
The Syrian government has not commented on the air strikes.
Israeli PM Benjamin Netanyahu later warned the warring parties in Syria against any attempt to heat up tensions with his country.
Speaking to members of his Likud Party today, Mr Netanyahu said Israel operated with "great force" against Syrian targets. "If needed," he said, Israel will use additional force.
Mr Netanyahu said that Israel will continue to "forcefully hurt" anyone who tries to attack it.