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Sir Mo Farah has insisted he has "no tolerance for anyone who breaks the rules" after his former coach was found guilty of doping violations.

Alberto Salazar coached the British athlete to four Olympic gold medals before the pair parted ways in 2017.

The 61-year-old has been banned for four years after being found guilty of doping violations.

The US anti-doping agency (USADA) confirmed multiple track and field athletes had been involved in the scandal.

In a statement, Sir Mo - who is not accused of wrongdoing - said he was "relieved" the USADA had completed their investigation into Salazar.

He added: "I left the Nike Oregon Project in 2017 but I have no tolerance for anyone who breaks the rules or crosses a line.

"A ruling has been made and I'm glad there has finally been a conclusion."

The USADA said Salazar violated anti-doping rules by trafficking or attempting to traffic testosterone, administering a prohibited method and tampering or attempting to tamper with anti-doping procedures.

Some of the methods banned by the agency include blood doping, artificially increasing oxygen levels, tampering with samples, intravenous infusions or injections and gene doping.

Salazar and his Nike Oregon Project, a prestigious running training group, had been under investigation.

A paid physician at the Nike Oregon Project, Dr Jeffrey Brown, also received a four-year ban for tampering with records, administering an intravenous infusion over the maximum limit and being complicit in Salazar's testosterone trafficking.

The investigation has involved testimony from anonymous whistleblowers, as well as emails and patient records, which were seen during two week-long hearings.

USADA chief executive officer Travis Tygart said: "The athletes in these cases found the courage to speak out and ultimately exposed the truth.

"While acting in connection with the Nike Oregon Project, Mr Salazar and Dr Brown demonstrated that winning was more important than the health and well-being of the athletes they were sworn to protect."

A Nike spokesperson said the ruling had "nothing to do with administering banned substances to any Oregon Project athlete" and it supported Salazar's decision to appeal.

"As the panel noted, they were struck by the amount of care Alberto took to ensure he was complying with the World Anti-Doping Code," the spokesperson added.

"We support Alberto in his decision to appeal and wish him the full measure of due process that the rules require. Nike does not condone the use of banned substances in any manner."

A spokesperson for the Board of UK Athletics said it had co-operated with anti-doping agencies during the investigations.

It added: "Furthermore the Performance Oversight Committee's own investigation in 2015 was restricted to the interaction of the Nike Oregon Project with Mo Farah and not an anti-doping investigation.

"Such investigations can and should only be undertaken by the relevant anti-doping authorities."

Sir Mo was part of the Nike Oregon Project between 2011 and 2017 but left the training group following the accusations against Salazar.

He did not publicly cite the allegations as a reason for the split.

Sir Mo has previously denied being involved in doping, telling reporters in 2017: "You can write what you like, I'm a clean athlete and as long as I understand that I sleep well at night."

In an emotional press conference, he said: "It's like I have achieved what I have achieved and you are trying to destroy it."

"You guys, so many times towards me, you have been unfair. I don't know why."