A Norfolk Football Association probe into secret filming and abuse at Norwich United has been escalated to a national investigations team.

Allegations of secret filming in the dressing room, verbal abuse and death threats first rocked the football club, based in Blofield, in September and have since seen the club resign from the Thurlow Nunn Eastern Counties League Premier Division after a host of its first-team players resigned.

First-team manager Darryl Tate also alleged that a member of the club had punched in him in the head twice.

Following the resignations the team, nicknamed the Planters, continued in the league - the ninth tier of English football - with its under-21 side before eventually quitting after a disastrous string of results.

READ MORE: Scandal-hit Norwich United QUIT football league following controversy

Shortly after, Norfolk FA launched an investigation into the claims, which a spokesman has now confirmed is continuing with officials at the national headquarters, at St George's Park in Burton.

It is not known when the investigation will conclude. The FA did not respond to a request for comment.

Following their resignation from the league, Norwich United's results have been expunged and it is thought there will be no relegation from the Thurlow Nunn Premier this season.