By Nidal al-Mughrabi and Ebrahim Hajjaj CAIRO/GAZA, June 16 (Reuters) - An Israeli strike killed at least two Palestinians in the central Gaza Strip, health officials said, as residents of an area in the north of the enclave fled their homes after Israeli forces expanded their control in the territory. Medics said an Israeli strike near a residential building in the Nuseirat refugee camp, in the central Gaza Strip, killed two brothers, Ahmed and Mahmoud Abu Heen. The Israeli military did not immediately comment.