European investigators say they have identified about 680 suspicious soccer matches including World Cup qualifiers and Champions League matches in a global match-fixing scandal spanning 2008-2011.
The European Union's police agency, Europol, has revealed evidence of fixing in about 380 matches across Europe and a further 300 games outside the continent.
Europol director Rob Wainwright said the investigation had identified about 425 corrupt officials, players and serious criminals in 15 countries. Fifty people have been arrested so far.
"This is match-fixing activity on a scale we have not seen before involving hundreds of criminals and corrupted officials and players, affecting hundreds of professional matches and generating very large amounts of illicit profits," Mr Wainwright said.
Investigators say the scam was backed by a Singapore-based betting cartel and had brought in at least 8 million euros ($A10.4 million) in proven profits after paying almost $2.5 million in bribes.
German police described a global network involving couriers ferrying bribes around the world, paying off players and referees, with the biggest bribe being $180,000.
Accomplices would then place bets on the internet or by phone with bookmakers in Asia, where bets that would be illegal in Europe were accepted.
"One fixed match might involve up to 50 suspects in 10 countries on separate continents," Friedhelm Althans, chief investigator for police in the German city of Bochum, said.
"Even two World Championship qualification matches in Africa, and one in Central America, are under suspicion."
Other matches fixed included World and European cup qualifying matches and top flight league matches in several European countries.
They also included two Champions League matches, including one played in Britain.
Investigators found that criminals from Asia also participated in the match-fixing and that some of the fixed matches took place outside Europe.
Investigators said no names of players or clubs would be released while the investigation proceeded.
'People will be shocked'
BBC sports commentator Phil Parry says the breadth of the corruption is astonishing.
"I think people will be shocked when they understand the scale of it and when they – the audacity of it, actually," he said.
"When we were talking about some of these high-profile competitions, which are globally known, and it seems to have tentacles that are touching every strata of football across the continent."
He admits the scandal will likely damage the code.
"I think in the short term it will certainly create some damage because people will start doubting the sporting integrity, they will start doubting some of the validity of results that have happened," he said.
"I think that from a long-term point of view actually, the action that's already been taken, as long as that campaign carries on, as long as we don't lose our vigilance in regards to this, then I think the battle can still be won and the sport can come out on top."
ABC/Reuters