LONDON (AP) — A British judge sent three Pakistan cricketers and an agent to prison on Thursday for their involvement in one of the biggest fixing scandals to tarnish the sport.

Former captain Salman Butt received 2½ years, the longest term of the three players. Mohammad Asif was sentenced to 1 year, while 19-year-old Mohammad Amir will serve six months.

Agent Mazhar Majeed was sentenced to 2 years, 8 months. All four may be released for good behavior after serving half their terms.

The players were found guilty of conspiring with Majeed to bowl deliberate no-balls as part of a betting scam during the test match against England at Lord’s last year.

Judge Jeremy Cooke told Southwark Crown Court that the offenses were “so serious that only a sentence of imprisonment will suffice to mark the nature of the crimes and to deter any other cricketer, agent or anyone else who considers corrupt activity of this kind.”

“In Pakistan, where cricket is the national sport, the ordinary follower of the national team feels betrayed by your activities, as do your fellow countrymen in this country,” Cooke said.

It’s the biggest fixing scandal in cricket since South Africa captain Hanse Cronje was banned for life in 2000 for taking bribes from bookmakers.