Five US Air Force refueling planes were struck and damaged on the ground at Prince Sultan air base in Saudi Arabia, The Wall Street Journal reported on Friday, citing two US officials.

The planes, which were hit during an Iranian missile strike on the Saudi base in recent days, were damaged but not fully destroyed and are being repaired; no one was killed in the strikes.

According to the WSJ report, this update indicates that at least seven Air Force refueling planes have been damaged or destroyed in recent days.

This figure follows an incident on Thursday in which two KC-135 refueling planes collided, resulting in one aircraft crashing to the ground. Tragically, all six crew members aboard were killed, as confirmed by the Pentagon on Friday.

This is a developing story.

Reuters contibuted to this report.