Egypt is building a massive refugee camp in the desert surrounded by high concrete walls, the Wall Street Journal (WSJ) reported on Thursday. The camp is being built because of concern about a mass exodus from the Gaza Strip in the event of an Israeli ground offensive in Rafah, according to the report. The WSJ cited Egyptian officials and security analysts as saying that more than 100,000 people could be accommodated in tents in the camp located near the border with the Gaza Strip in the Egyptian Sinai desert. For weeks, Egypt has been trying to increase security along the border with the Gaza…