(CNN)The regional governor of Tanzania's largest city, Dar es Salaam, has vowed to arrest people suspected of being gay by next week in an escalating crackdown on LGBT communities in the East African nation.

"I have received reports that there are so many homosexuals in our city, and these homosexuals, are advertising and selling their services on the internet," said the official, Paul Makonda.

"Therefore, I am announcing this to every citizen of Dar es Salaam. If you know any gays ... report them to me," he told reporters in Swahili in a video from a Monday news conference that has emerged on social media.

Makonda, who has ordered anti-gay crackdowns before, said a task force will begin mass arrests of LGBT people in the city by Monday.

CNN has sought multiple requests for comment from the governor, but hasn't received a response. Read more via CNN