The destroyer USS Mason fired defensive countermeasures in response to what may have been incoming missiles, ABC news reported quoting a defense official. 

"A US Strike Group transiting international waters in the Red Sea detected possible inbound missile threats and deployed appropriate defensive measures," said a U.S. defense official. "Post event assessment is ongoing. All U.S. warships and vessels in the area are safe."

The ship had been attacked two times before in the past week, which triggered retaliatory strikes against radars used by Houthi rebels in those attacks. The Pentagon is investigating the incident.

U.S. officials had said earlier Sunday that the Mason had come under attack from two inbound missiles that originated in Houthi-controlled territory in Yemen.

"We are aware of the reports and we are assessing the situation," a U.S. defense official had said earlier. "All of our ships and crews are safe and unharmed."

According to one U.S. official, an initial report indicated that the destroyer had deployed defensive missiles, which resulted in the interception of one of the missiles, and that the other may have fallen into the sea. It now appears the destroyer fired missiles at what may have been incoming missiles.

The "post-event assessment" will determine what actually occurred Saturday, the official said.

Another U.S. official said of Saturday's incident, "We will continue to defend freedom of navigation in this critical waterway, and we will take all necessary steps to respond to threats and defend our personnel and ships."

Friday, a senior Administration official said there was "no doubt" that Houthi militants were behind the missile attacks on the Mason. The official said it was unclear what may have motivated the attacks and speculated that there may be factions within the group who have different agendas.

Source: MENA