"Clearly this is a complex investigation, which has involved a significant number of cases which have had to be examined in detail.
"We are methodically working our way through this and we are making progress. We have contacted everyone affected by this investigation to explain the situation to them and we continue to provide specialist support from Family Liaison Officers.
"We understand however that other people may have concerns and we have a dedicated phone line for callers to leave a message for the investigation team.
"That number is 01642 301677.”
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Middlesbrough's survival hopes were seriously dented after slipping to a 1 nil defeat at the hands of relegation rivals Crystal Palace.
The 2-0 defeat - their sixth in 11 league matches - for bottom side Sunderland saw them slip four points from safety .
Ciaran Clark's 82nd-minute header earned a huge point in the race for promotion after the Robins had gone in at half-time with a shock lead