By Maayan Lubell JERUSALEM (Reuters) - The Israeli military began searching on Wednesday for tunnels that Lebanese Hezbollah guerrillas may have dug, responding to concerns from residents of a small nearby village in **rthern Israel, a military source said. Israel's vulnerability to cross-border tunnels was exposed during a July-August war with Gaza's Islamist Hamas, when Palestinian militants infiltrated through a network of secret passages to carry out attacks. We have ** intelligence indicating Hezbollah has dug a tunnel, but anything is possible," the source said. "It is the first time we are conducting a search on this scale." Residents of in the area, under fire from Hezbollah rockets during a month-long war in 2006, have at times reported underground **ises and fear that militants are digging tunnels.