Gay rights groups and activists pressed ahead with the Istanbul Pride parade on Sunday despite Turkish authorities banning the event for the fourth year in a row.
Around 1,000 people gathered near the city's famous Istiklal Avenue and Taksim Square where organisers had wanted to originally hold the parade, an AFP photographer at the scene reported.
The activists unfolded a large rainbow flag while a press statement was read out amid heavy security in the area.
But police then warned activists to disperse and used rubber bullets against some who tried to access Istiklal Avenue, the photographer said.
Amnesty International in Turkey later said on Twitter that 11 people had been detained as it called on police to "immediately" release them. The human rights group also said tear gas had been used against some activists.
The Istanbul governorate told the organisers that officials "could not take steps to secure their safety and did not find it appropriate for the Pride Walk to take place", according to a statement from Istanbul LGBTQI+ Pride Week on Facebook late Friday.
The Istanbul governor's office issued no public statement about the event.
"The governor cited the excuse of security in its decision to ban the march and in one word, this is comical. Our marches went on peacefully without being banned for 13 years," the organisers said in a press statement on Facebook hours before the march.
"We LGBTI+ (lesbian, gay, bisexual, transgender, intersex) are here with our pride despite all vain attempts to prevent us and we do not recognise this ban," they added.
"People are not afraid, shopkeepers are not afraid. However, the governorship is afraid, the police are afraid. They think that they can restrain freedom with the barricades they set up and the tear gas," one activist at the march told AFP.
The annual rally is the most important LGBTQI+ event in a Muslim country in the region.
The Ankara governorate on Thursday banned a screening of the 2014 film "Pride" organised by the Communist LGBTQI+ group, saying such events could "incite hatred and enmity".
The governor's office added that there could be "danger to public safety".
The capital's governorate in November issued a ban on LGBTQI+ events but gay rights groups said they would take legal action against the order.
Although homosexuality is legal in Turkey, LGBTQI+ individuals frequently cite abuse and harassment.
