Actor-comedian-author Stephen Fry on Saturday was among the hundreds protesting Russia's anti-gay laws outside Downing Street in London.

The laws, signed in recent weeks by Russian President Vladimir Putin, prohibit gay and lesbian couples from adopting Russian-born children and the public promotion of gay rights where minors might be present, effectively banning Gay Pride marches and similar demonstrations. Russian officials have said that its “gay propaganda” law would be in effect at the Winter Olympics at Sochi and that athletes or guests who violate the law will be detained.

“What they have done is unleashed thugs who have done unspeakable things to teenagers, lured them, beaten them, humiliated them, tortured them,” Fry told reporters. “This continues to be the case.”

“Lesbians have been raped 'correctively' – as the horrible phrase is. The police are doing nothing about it.”

“The fact that the law says it is illegal to discuss homosexuality as a normal practice to anybody under the age of 18 is a preposterous thing.”

Last week, Fry wrote an open letter to Prime Minister David Cameron, in which he asked him to back moving the Winter Olympics, scheduled for February, to another city.

(Related: Stephen Fry calls for Russian Olympic ban over anti-gay laws.)

On Saturday, Cameron responded via Twitter: “I share your deep concern about the abuse of gay people in Russia. However, I believe we can better challenge prejudice as we attend, rather than boycotting the Winter Olympics.”

On Friday, President Barack Obama said a boycott would not be “appropriate.”