Residents of northern Israel brace for all-out war with Hezbollah

Eli Harel was an Israeli soldier in his early thirties when he was sent into Lebanon in 2006 to battle fighters from the Iranian-backed group Hezbollah in a bloody, largely inconclusive month-long war.

Now 50, Harel is ready to rejoin the army to fight the same group if shelling along Israel's northern border turns into a full-blown war with Iran's most powerful regional proxy.

This time Israeli forces would face some of the most challenging fighting conditions imaginable, he said.

"There are booby traps everywhere," he told Reuters. "People are popping up from tunnels. You have to be constantly on alert otherwise you will be dead."

Harel lives in Haifa, Israel's third biggest city, well within range of Hezbollah's weapons. Haifa's mayor recently urged residents to stockpile food and medicine because of the growing risk of all-out war.

Israel and Hezbollah have been engaged in escalating daily cross-border strikes over the past six months - in parallel with the war in Gaza - and their increasing range and sophistication has spurred fears of a wider regional conflict.

Like Hamas, the militant Palestinian group battling Israel in Gaza, Hezbollah has a network of tunnels to move fighters and weapons around.

Its fighters have also been training for more than a decade with Syrian President Bashar al-Assad's forces.Hezbollah has so far restricted its attacks to a strip of northern Israel, seeking to draw Israeli forces away from Gaza.

Israel has said it is ready to push Hezbollah back from the border, but it is unclear how.