The Interior Ministry has received 168 reports of breaches of election rules since the campaign for president and vice president began, the ministry's situation centre said. The figures are as of 2pm.
Most of them, 143, are about vote buying. Six concern illegal campaigning, one is about corporate voting, and 18 are about other violations in the voting process.
Police have opened six criminal cases. Four are for offences under articles 167-169g of the Criminal Code, and two are fast-track cases.
Officers have drawn up 1,226 warning notices under article 65 of the Interior Ministry Act.
Across Bulgaria, police have carried out 180 special operations against crimes against citizens' political rights.
Updated (27.10, 13:29): The Interior Ministry's situation centre says it had logged 217 reports of violations by 3pm on 25 October, not the 168 first announced. Of these, 165 concern vote buying, 12 illegal campaigning and 39 other violations. The earlier figures were 143, six and 18.