Borislav Mihaylov confirmed he has resigned as president of the Bulgarian Football Union following the racist chanting that marred England’s 6-0 victory in Sofia on Monday and, having done so, hit out at Gareth Southgate, accusing the England manager of exaggerating the nature of the chanting that was directed at the visiting black players during the Euro 2020 qualifier.

Mihaylov was speaking at a press conference on Friday that followed a meeting of the BFU’s executive committee, during which it was decided that the national team manager, Krasimir Balakov, and the entire committee would also quit.

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“There were four or five people making the chants,” said Mihaylov during the press conference and with his resignation having first been reported on Tuesday. “The second time the match was stopped only England manager Gareth Southgate had heard them.

“We did what we had to do regarding the security during the game versus England. Bulgaria is not a racist country. And my decision to step down has nothing to do with prime minister [Boyko] Borissov asking for my resignation the day after the game. My patience is over.”

Balakov came under criticism after claiming he could not hear any of the racist abuse that took place at Stadion Vasil Levski. Step one of Uefa’s anti-racism protocol was activated just before the half-hour mark, with the referee asking for a public address announcement to be made ordering the abuse to stop. However, it continued and although there was a short stoppage just before half-time, the game was completed.

Balakov later issued a statement making a “sincere apology” to the England team and anyone else offended by the racist abuse but it was not enough to save the 53-year-old’s job.

“I am no longer a national team coach and I wish success to the next coach. The situation is not rosy,” Balakov said in quotes reported by sportal.bg. “I’m a professional and I know there are times like this in my life. I will look for my next chance. I will rest now.”

The BFU announced Mihail Kasabov had taken the presidency on a temporary basis, after vice-presidents Yordan Lechkov and Atanas Furnadzhiev had declined to take it on. Kasabov will need to organise an extraordinary congress to elect a new executive committee.

Facebook Twitter Pinterest Krasimir Balakov during the Euro 2020 qualifier. Photograph: Georgi Licovski/EPA

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Five more men have been arrested over the events of Monday night. They were detained at the First District police station in Sofia while a further five were searched at a different precinct in the Bulgarian capital, taking the total number identified to 16, a spokeswoman for the interior ministry told PA Media.

Six supporters were arrested on Wednesday, with four already having been banned from attending any sporting event for the next two years and fined 1,000 lev (£440). The ministry spokeswoman said the search to identify further individuals continues.