Israeli forces unleashed a series of strikes on the Yemeni capital Sanaa and the western city of Hodeidah on Thursday, killing at least six people and injuring dozens more, the Houthi militant group said in a statement.

The latest round of strikes occurred as the United States and its ally Israel struggle to halt a campaign of regional assaults by Yemen’s Houthi militants.

The targets struck by U.S. forces had been used to attack American warships and commercial vessels, officials said.