An Iron Dome aerial defence system battery is seen in the foreground (L) as fire rages early on May 12, 2021 at Ashkelon's refinery, which was hit by Hamas rockets the previous day, in the southern Israeli city. - Intense fighting between Palestinian militants and the Israeli army continued overnight, after Israel's prime minister warned the Hamas movement that they will pay a "heavy price" for firing rockets from Gaza into Israel. (Photo by JACK GUEZ / AFP)