Yemen's Houthi rebels have warned that any Israeli vessel in nearby Mideast waters is now a target, as Israel continues to block aid to the Gaza Strip. The warning threatens the crucial maritime waterway between Asia and Europe, as well as revenue from Egypt's Suez Canal and aid shipments to war zones. The rebels have a loose definition of what constitutes an Israeli ship, meaning other vessels could also be targeted. The warning covers the Red Sea, the Gulf of Aden, the Bab el-Mandeb Strait, and the Arabian Sea.