One person has been arrested during a protest over a drag queen story-telling event at the Tate Britain art gallery.
The London gallery was hosting a story time by children's author and drag queen Aida H Dee.
Protesters held signs that read: "No drag for kids!" and "Leave our kids alone!"
A separate group of demonstrators, led by Stand Up To Racism, also gathered outside the gallery in support of the event.
Signs from the second group read: "Don't let the far right divide us" and "Trans rights now".
About 30 protesters clashed with similar numbers of counter-protesters who appeared in support of the story-telling.
Officers from the Met were at the scene until about 15:00 GMT
The Metropolitan Police said one person had been arrested on suspicion of making a racially aggravated comment towards a police officer outside the gallery.
No injuries had been reported and officers were at the scene until about 15:00 GMT.
The Tate was hosting Drag Queen Story Hour UK, with tales told by Aida H Dee, who the gallery's website describes as "the first drag artist in Europe to read stories to children in a nursery".
On Twitter, the author and drag queen said the day had been "proper emotional", adding that five protesters had gained entry to the Tate and "caused a disruption" in parts of the building, but they did not affect the readings.
Alex, from London, joined the second group of demonstrators on Saturday afternoon to protest against "impingement on LGBTQ people's rights".
"They are protesting about something truly wonderful that is just about expression and art and creativity," she said.
"I believe that actually panto for example has been a part of all entertainment forever and it fundamentally involves men in dresses telling stories to children."
Meanwhile Cheska, a woman in her 30s from London, said she was protesting as she felt drag queens were "not suitable" for children.
"We have concerns because we feel that the costume Aida H Dee wears is sexually inappropriate," she said.
"We're here because we feel that drag queens are great but for people who are over 18. We feel like they are not suitable for anyone who is under 18."
Tate Britain said none of its events was disrupted by the protest.
A spokesman for the gallery said: "Police attended a disturbance outside Tate Britain this morning.
"The gallery has remained open to visitors throughout the day and all events went ahead as planned."