Cairo: Six Egyptian men arrested for "promoting sexual deviancy" and "debauchery" on social media will be subjected to anal examinations ahead of their October 1 trial, Amnesty International said on Saturday.

Their arrest is part of a wider crackdown against homosexuality that started last week when a group of people were seen raising a rainbow flag at a concert, a rare public show of support for lesbian, gay, bisexual and transgender rights in the conservative Muslim country.

Egyptian authorities said they have arrested people for raising a rainbow flag at a concert by Mashrou' Leila. Credit:AP

At least 11 people have since been arrested, Amnesty said, and one man has been sentenced to six years in jail after local media launched a highly critical campaign against those who raised the rainbow flag at a Mashrou' Leila concert, a popular Lebanese alternative rock band whose lead singer is openly gay.

Amnesty said the Forensic Medical Authority was due to subject the six men to anal examinations to determine whether they have had homosexual sex.