By Nidal al-Mughrabi GAZA (Reuters) – Palestinian militants in Gaza fired dozens of rockets into Israel on Friday in response to Israeli airstrikes which killed at least 10 people, including a senior commander of the Palestinian Islamic Jihad movement. As darkness fell, Israeli authorities said sirens had been sounded in southern and central areas, while images broadcast by Israeli television stations appeared to show a number of missiles being shot down by air defence systems. In Tel Aviv, Israel’s economic centre, witnesses said they could hear booms but there were no reports of sirens. Isla…