"Firefighting units, assisted by various entities, are working to extinguish the fires," Israeli police said in a statement, adding that several homes in Kiryat Shmona had been evacuated.

An AFP photographer in the northeastern town saw intense blazes engulfing parts of the area bordering Lebanon, the scene of near-daily exchanges of fire between the Israeli army and the Iran-backed Hezbollah militant group on the sidelines of the war in Gaza.

The Israeli army said it had deployed reinforcements to support firefighters overwhelmed by the scale of the fires.

"Six IDF reservist soldiers were lightly injured as a result of smoke inhalation and transferred to a hospital to receive medical treatment," the army said.

"The forces gained control over the locations of fire, and at this stage, no human life is at risk," it added.

Leaders of the army's Northern Command had arrived in Kiryat Shmona during the night and the army was "conducting a situational assessment" in the sector.

The office of Israeli Prime Minister Benjamin Netanyahu said it was closely monitoring, together with the army, the development of the fires, which broke out on Monday after rocket fire and the fall of drones launched from Lebanon.

In retaliation, the Israeli army announced it had carried out air strikes against what it said were Hezbollah targets in southern Lebanon.