President Donald Trump told US military service members on Thursday his administration had ordered "a lot more" B-2 Spirit stealth bombers made by Northrop Grumman, after the aircraft's use in US strikes on Iran's nuclear sites earlier this year.

"Those beautiful B-2 bombers, they totally obliterated the nuclear potential nuclear supply of Iran," Trump said.

"We just ordered a lot more of them, and the reason we did is they were totally incredible, totally invisible."

This is a developing story.