Israeli warplanes bombed several sites in southern Gaza overnight in response to rocket fire from the Hamas-run enclave, the army said today. There were no immediate reports of casualties from the Palestinian side. The attacks came in response to rocket fire from the impoverished enclave over the past several days, the army said in a statement. The rocket fire did not result in any injuries. Israel has repeatedly targeted the vast network of tunnels used to smuggle food, construction materials as well as weapons from Egypt into Gaza, which has been under a punishing blockade since Hamas seized control there in June 2007.