The Israeli army said early Wednesday it had carried out bombardments on positions of Lebanon's Hezbollah in Syria in a bid to thwart its "entrenchment" in the country.
While fighting Hamas militants in Gaza, Israel has repeatedly said it was also ready to confront Hezbollah and has stepped up strikes, including in Syria, in recent weeks.
An Israeli army statement said the army had "struck military infrastructure that based on precise intelligence was used by the Hezbollah terrorist organization on the Syrian front."
The military released a video of a strike against a building.
Israel has been waging one major campaign against Hamas in Gaza since the October 7 attacks by the group last year and international concern has been expressed about the possible spread of the conflict.
The Israeli army said it "holds the Syrian regime accountable for all activities which take place within its territory and will not allow for any attempted actions which could lead to the entrenchment of Hezbollah on the Syrian front."
"In parallel, in the past hours, the IDF (Israeli army) struck a number of Hezbollah observation posts and terrorist infrastructure in southern Lebanon," the statement added.
"Throughout the day, IDF artillery struck to remove threats in the areas of Dhayra and Tayr Harfa in southern Lebanon," the statement said.
On Tuesday, Israel said its warplanes had hit a Syrian military position in response to rocket fire from southern Syria on the Israeli-annexed Golan Heights.
The Syrian Observatory for Human Rights, a monitoring group based in Britain, said Israeli jets staged raids in Syria on Tuesday and late Monday.