Washington/Tehran, April 4 -- One of the two US pilots who ejected from a F-15E fighter jet downed over Iran on Friday was rescued, while search-and-rescue efforts were underway to locate the second American airman.

This is the first such incident since the start of the five-week long-war.

US officials familiar with the situation said one crew member was still missing late on Friday, after Iranian state media released images of a tail fin and other debris accompanied by an initial claim that an advanced US F-35 had been hit by a new air defence system over central Iran.

The wreckage pictured was from a F-15E, from the US air force's 494th squadron, based at RAF Lakenheath in the UK. Markings on the wreckage appeared to match those on the...