The US military said Sunday it shot down two anti-ship ballistic missiles fired toward a container ship by Yemen’s Houthi rebels in the Red Sea. Hours later, four boats tried to attack the same ship, but US forces opened fire, killing several of the armed crews, the US Central Command said. No one was injured on the ship.

The Singapore-flagged Maersk Hangzhou reported they had already been hit by a missile Saturday night while transiting the Southern Red Sea and requested assistance, Centcom said in a statement. The USS Gravely and USS Laboon responded to the call for help, and the Denmark-owned vessel was reportedly seaworthy and no injuries were noted, the statement added.