Pro-Iran militias in Syria vowed on Thursday they would respond forcefully to an Israeli strike over Syria's Palmyra area in the province of Homs on Wednesday evening.
It was the second such strike within a week.
The Syrian defense ministry said in a statement that one soldier was killed in the attack that targeted a communications tower and caused some damages.
Israel has for several years been mounting attacks on what it has described as Iranian-linked targets in Syria, where Tehran-backed forces including Lebanon's Hezbollah have put down a presence since deploying to help President Bashar al-Assad in the Syrian conflict that erupted in 2011.
A statement by the so-called operations room of Assad's Iran-backed allies promised that the response to the strike would be "very cruel".
"As a result of this attack a number of martyrs and injured from our Mujahedeen brothers have fallen," the statement said without further elaboration.
"We have taken a decision to respond to this attack in revenge for the martyrs and the blood of the injured and the response will be very cruel," said the statement published on pro-Iranian news outlets.
