Four crew members were killed in ​an attack by Iran-backed Houthis on a cargo ship in the Bab el-Mandeb strait on Tuesday, Yemen's transport ministry said, while the U.S. military said it struck a container ship attempting to sail toward an Iranian port, Reuters reported. 

Two Yemeni rescuers from an anti-Houthi military group were also killed in the Bab el-Mandeb attack, Yemen's Coast Guard said.