By Bassam Masoud and Maayan Lubell GAZA/JERUSALEM (Reuters) -Hundreds more Palestinians were killed as Israel fought Hamas militants in the Gaza Strip’s biggest cities on Thursday, and almost 2 million displaced Gazans facing shortages of food struggled to find safe refuge. Residents reported fierce battles going on east of Khan Younis, southern Gaza’s largest city. Palestinian health officials said three Gazans were killed in an Israeli airstrike on a house in Deir Al-Balah in central Gaza. Israel said its forces killed a number of gunmen in Khan Younis, including two who emerged firing from …