Israeli warplanes fired on two sites in the southern Gaza Strip early Sunday, causing severe damage, without injuries. According to eyewitnesses, Israeli jets hit a concrete production site west of Rafah, and an underground tunnel in al-Salam neighborhood east of the city. Both sites sustained severe damage, they said. Medical sources in Gaza said there were no injuries in the raids. An Israeli army statement said the airstrikes hit a \"weapon manufacturing site and a smuggling tunnel, in response to the rockets fired at Israel over the weekend.\"