Israeli warplanes bombed the Hamas-ruled Gaza Strip on Friday, as Palestinians fired rockets and launched fire bombs into southern Israel, the army said. Parts of southern Israel were partially cordoned off by the security forces. Israeli planes launched raids against Gaza shortly after midnight Thursday and then again later on Friday morning. Israel said the bombs were in response to seven rockets launched from Gaza, six of which were intercepted by its air defences. Witnesses in Gaza said rockets were launched towards the town of Sderot, just across the border. The rocket that was not intercepted damaged the roof of a house in Sderot, but did not cause any casualties, an AFP photographer said. Israel has bombed Gaza almost every night since August 6 in retaliation for the launch of balloons fitted with fire bombs, or, less frequently, rocket fire, across the border. The number of rockets fired from Gaza was the largest number in a day since the latest round of exchanges began two weeks ago. Hamas “will not hesitate to fight a battle with the enemy if the escalation continues, if the bombardments and the blockade continue,” Hamas spokesman Fawzi Barhum said in a statement. “If the Israeli occupation continues its aggression… it must pay the price,” he added. Israeli Defence Minister Benny Gantz on Friday warned the army would “attack our attackers and deal them a very heavy blow”.