It is reported by Sky News with reference to the UK coast guard.

As specified, the pilot is still not found.

UK Coastguard has located the wreckage from the US F-15 jet that crashed into the North Sea earlier today and recovery efforts are underway but the pilot remains missing

- Sky News Breaking (@SkyNewsBreak) June 15, 2020

Earlier, the American F-15C fighter crashed in the North Sea off the coast of Yorkshire in the UK.