Six men were originally arrested in connection with spot-fixing in December 2013 - among them Blackburn striker DJ Campbell and Portsmouth's Sam Sodje - but were bailed until April 8th pending further inquiries.
Those six have now been re-arrested along with a further seven footballers according to a statement on the National Crime Agency website.
"In December 2013 the NCA arrested six men in connection with an investigation into individuals suspected of Conspiracy to commit acts of Bribery and Money Laundering relating to conduct during football matches," read the NCA statement.
"Officers from the NCA have been actively pursuing a number of lines of inquiry in this ongoing investigation. The NCA have today re-arrested the six original suspects based upon new evidence, along with a further seven footballers aged between 18 and 30 suspected of potential involvement in these offences.
"The seven men arrested in addition to the original six are from Football League clubs based in the North West of England. All 13 individuals are being interviewed at police stations across the country.
"The investigation began following receipt of material from the Sun on Sunday. It remains ongoing and we cannot provide further detail at this stage."
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