Israel has launched a series of air strikes in the Gaza Strip, targeting a Hamas security complex and tunnels used to smuggle weapons after vowing a “disproportionate” response to Hamas rocket attacks.The aircraft carried out a number of bombing raids after three Israelis, including two soldiers, were injured in a mortar salvo. The Israeli air force targeted tunnels along Gaza’s border with Egypt in an area known as the Philadelphi corridor. A Hamas security outpost was also hit, but residents say the building had been vacated before the planes arrived. However, one Palestinian was killed and three others injured after a car was destroyed. Meanwhile Egypt, backed by the United States, is at work trying to broker a long-term ceasefire that would end arms smuggling into Gaza and lead to the reopening of the Strip’s border crossings.