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The BBC has apologised after sexual noises interrupted live television coverage of the FA Cup.

Moaning was heard while Gary Lineker presented the third-round replay between Wolves and Liverpool on Tuesday.

The football pundit later posted a picture of a mobile phone he said was "taped to the back of the set".

"We apologise to any viewers offended during the live coverage of the football this evening," the BBC said.

A spokesperson said the BBC was investigating the incident.

Lineker tried to laugh off the incident as he presented the programme in a studio at Wolverhampton's Molineux Stadium alongside pundits Paul Ince and Danny Murphy.

As he cut to colleague and fellow former England striker Alan Shearer in the commentary gantry, he said: "Somebody's sending something on someone's phone, I think.

"I don't know whether you heard it at home."

When the match started, he shared a picture of a mobile phone on Twitter and three laughing emojis alongside the words: "Well, we found this taped to the back of the set.