Thirteen people have died and dozens of others have been injured, most of them women and children, in an air attack on the Nuseirat refugee camp in the centre of the Gaza Strip, the Palestinian news agency WAFA reported. The agency cited local sources, who attributed the attack to Israeli forces. The Israel Defense Forces (IDF) have not as yet commented, and the report could not be independently verified. The building struck in the attack is reported to be a former school, which has been used as a shelter for families who have fled their homes elsewhere in the Gaza Strip since the start of the…