The Football Association is demanding "a full explanation" into how viewers missed a crucial FA Cup goal due to a technical hitch.

Everton's winning strike in extra time happened as ITV1's coverage abruptly went to an advert break.

ITV boss Michael Grade has said the glitch, which has prompted 1,000 complaints, was "inexcusable".

An automated system for screening adverts was still in place during the extended Liverpool v Everton match.

It is used when schedules are running normally, and fails to take overruns into account.

In a statement, ITV called the occurence an "unprecedented transmission error".

But the FA has called for a fuller explanation, saying the mistake was "very disappointing".