ISTANBUL (AP) — Turkish police detained 11 people Thursday for supporting a one-day shopping boycott the previous day as part of protests against the imprisonment of President Recep Tayyip Erdogan’s main rival, state-run media reported.

The Istanbul Chief Public Prosecutor’s Office issued arrest warrants for 16 suspects in an investigation into “hatred and discrimination” and “inciting hatred and hostility” among the public, the Anadolu news agency said.

Included in those detained was actor Cem Yigit Uzumoglu, who played Sultan Mehmed the Conqueror in the Netflix docuseries Rise of Empires: Ottoman, the Actors’ Union said.

The suspects were held over social media posts calling on people to not to spend money on Wednesday and for businesses to shut their doors in solidarity.

Large-scale anti-government protests began last month after the jailing of Istanbul’s opposition Mayor Ekrem Imamoglu on corruption charges that critics say are politically motivated. The government insists the judiciary is independent and free of political interference.

Istanbul prosecutors on Tuesday launched a criminal investigation into earlier boycott calls by Imamoglu’s party targeting companies it alleges support the government. In particular, the opposition identified media firms that did not air images of protests in which hundreds of thousands of people flooded the streets to call for Imamoglu’s release and an end to democratic backsliding.

While in prison, Imamoglu has been confirmed as the presidential candidate of the Republican People’s Party. The next election is currently scheduled for 2028 but is likely to take place earlier.

According to the independent ANKA News Agency, some 2,000 people have been detained since Imamoglu was arrested on March 19, with 316 jailed pending trial. Most face charges relating to participating in protests.

Lawyers for imprisoned protesters on Wednesday said many had suffered mistreatment. The government has not responded to the allegations but on Thursday the police issued a statement denying claims that women had been sexually assaulted in custody as “vile slanders.”