The United States is reminding American nationals that a travel warning remains in effect for Israel, the West Bank, and Gaza The State Department on Wednesday re-issued its travel advisory, urging US citizens and diplomatic personnel to avoid the Hamas-ruled Gaza Strip and certain areas of Area A in the West Bank."The security environment remains complex in Israel, the West Bank, and Gaza," the State Department said. "US citizens need to be aware of the continuing risks of travel to areas...where there are heightened tensions and security risks."Last month, Ezra Schwartz, a Massachusetts native, was killed in a terrorist attack by a Palestinian gunman in the Gush Etzion cluster of Jewish settlements between Jerusalem and Hebron.