Story highlights Officials Saturday night were uncertain about what exactly happened

The Mason and its crew are all safe

(CNN) The Navy destroyer USS Mason fired countermeasures in the Red Sea on Saturday after it detected what it believed were incoming missiles.

Officials Saturday night were uncertain about what exactly happened, if there were multiple incoming missiles or if there was a malfunction with the radar detection system on the destroyer.

"We are aware of the reports and we are assessing the situation. All of our ships and crews are safe and unharmed," one US defense official told CNN.

The USS Nitze and the USS Ponce were sailing nearby.

There are initial unconfirmed reports of missiles possibly being fired from positions both ashore on Yemen and by small spotter boats operated by Houthi rebels.

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