Jakarta's governor, Basuki Tjahaja Purnama, is a minority in Indonesia. He's a Christian and ethnically Chinese.
Indonesia is the world's most populous Muslim nation, and an increasing number of conservative Muslims say he shouldn't administer a majority-Muslim city.
Purnama dismissed political attacks that urged voters not to vote for him by citing a verse from the Koran, Reuters reported.
In response, an estimated 200,000 people took to the streets in Indonesia's capital, calling for Purnama to be jailed or killed, according to CNN.
Critics have said that Indonesia's president, Joko Widodo, has not done enough to placate religious and ethnic tensions leading up to the 2017 gubernatorial election in Jakarta.
Purnama, commonly known as Ahok, is competing with two Muslims to keep his job.
A group called the Islamic Defenders Front called for the governor to be jailed.
Purnama apologized for his remarks and police are investigating the case against him, according to Reuters reports.
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