At least 2,462 “No” campaigners were detained and 453 sent to jail during the 85-day campaign in the run up to a referendum in Turkey to extend the country’s presidential powers.

According to a recent report released by the pro-Kurdish Peoples’ Democratic Party (HDP), the past two months were a “total violation of democratic principles across the country.”

A constitutional reform package seeking to introduce an executive presidency in Turkey was approved by 51.4 percent of the voters in Sunday’s referendum.

During the voting, some citizens cast their votes in unstamped ballots while some citizens used envelopes and ballots they brought with them, which prompted some opposition parties and naysayers to raise suspicions about the votes’ validity.

In a statement on Monday morning, the YSK said the ballot papers and envelopes brought by some citizens from outside were produced by the YSK and they are authentic.

Demonstrations have been held across Turkey to protest the YSK decision to consider the unstamped ballots valid.