At least five people were killed and six others injured in an Israeli airstrike on a residential apartment in Gaza City’s western Rimall area early Saturday, medical workers at Al-Shifa Hospital said.Al Jazeera correspondent Hani Al-Shaer, reporting from Khan Younis, said the strike hit the Al-Asala building without any prior warning.The attack took place while residents were asleep, he said.We could hear the sound of the warplanes getting louder and louder. Then three strikes were carried out, killing people inside the apartment, Al-Shaer said.The explosion tore through the targeted apartment and caused extensive damage to lower floors of the multi-storey building.The fire continued to burn for about an hour before Palestinian Civil Defence teams managed to put it out. Al-Shaer described the scene as horrific.Several residents were trapped under the rubble, he said. Civil Defence workers continued searching the site for missing people and bodies.Israeli drones were seen flying over the area during the rescue operation, while the sound of warplanes flying at low altitude could also be heard across Gaza, according to Al-Shaer.Al-Shifa Hospital said four of the five people killed were women. Among them were an elderly Christian woman and her daughter.The six injured people were taken to Al-Shifa Hospital for treatment. Rimal is one of the most densely populated residential areas of Gaza City. Thousands of displaced people are sheltering there in temporary tents and camps.