Several Palestinians were killed and others injured tonight in a series of Israeli airstrikes that targeted a number of civilian houses in different areas in the besieged Gaza Strip, said sources.Two Palestinians were killed and ten others injured in an Israeli airstrike that targeted a house in Deir al-Balah, in central Gaza.Israeli warplanes also shelled two houses in the al-Sabra neighborhood, in central Gaza City, killing and injuring a number of people and causing massive damage to nearby homes.Several people were also killed and injured in an Israeli airstrike that targeted a house in the al-Zaytoon neighborhood, destroying it completely. Source: Palestine news and Information Agency - WAFA