Police have raided the homes of three referees implicated in the match-fixing scandal which has hit German football, according to reports.
German ref Robert Hoyzer admitted receiving bribes
Referees Juergen Jansen, Felix Zwayer and Dominik Marks are among 25 people under investigation on suspicion of manipulating 10 matches.
The move came as more than 150 police raided 32 premises in 10 German states on Wednesday.
The scandal began when referee Robert Hoyzer admitted he had rigged matches.
Hoyzer, 25, admitted match-fixing charges in January and has promised to co-operate fully with an ongoing investigation.
A total of 14 players are among those under investigation, although the Berlin prosecutor's office has not named them.
The scandal was ignited when Hoyzer's role in second division Hamburg SV's 4-2 defeat by regional side SC Paderborn came under suspicion.
Jansen, who normally referees matches in the Bundesliga's top division, was pulled from Sunday's Bundesliga match between Werder Bremen and Hansa Rostock.
He has previously denied any involvement in the match-fixing affair.