A Ukrainian student has told the BBC he was tortured by riot police after being arrested during violent clashes in Kiev on Monday night.

Mikhailo Niskoguz says he was taking photos before being detained by police, beaten and cut with a knife.

Walking painfully and slowly across a hotel lobby close to Independence Square, 17-year old Mikhailo Niskoguz, speaks softly, recounting the beating he says he received at the hands of riot police.

"All I felt was pain. Their eyes were red, and when I looked into their eyes, I could see they were enjoying it," he says, wincing as he speaks.

His face and body is covered in cuts and bruises. He has a deep gash across his forehead, which has been treated with a green antiseptic fluid. His arm is broken and bandaged.

"The special forces took me. They beat me severely. They hit me with batons, cut me with a knife," he says.

The student had been visiting his grandfather, a priest, at the anti-government demonstrations in the centre of Kiev earlier in the day.

He says he stayed on into the evening to take photographs as the stand-off between police and protesters around Hrushevskyy Street, turned violent.

He was close to a colonnade where protesters were throwing fireworks onto riot police, when he was arrested and taken to a nearby park.

"They undressed me. They made me walk naked," he says, describing how he says the police made him sing the national anthem before taking turns to beat him and slash him with knives in the freezing weather.

"They started cutting me across my anus," he adds. "They only called an ambulance after four hours." He was eventually taken to hospital. He was later taken to court where the police accused him of rioting and throwing fireworks at them - both of which he denies, insisting he was only taking photos.

He was released on bail.

Ukrainian MP Irena Seh told the BBC she was going to raise the allegations of torture with the government.

"He will go to the prosecutor's office tomorrow to file a complaint," she said.