TWO teenagers have plunged to their death while allegedly having sex on a balcony at a luxury London apartment block.

The students, named as Anastasia Tutik, 19, from Russia, and “Miguel”, 18, from Mexico, died instantly after falling from the sixth floor of a flat on the banks of the River Thames.

The international students had just met at a party where they were celebrating their end-of-year exams, the Mirror reports.

The horrific tragedy was witnessed by Samson Oguntayo, 32, and his partner Blessing, who live in the block opposite the luxury complex in Deptford, East London.

“They were trying to have sex on the balcony. The guy was lifting the girl and putting her on the banister, he kept on doing it,” Mr Oguntayo said.

“He was putting her on there — they were going back and forth. You could see they were doing some really dangerous stuff.

“It is not the first time we have seen people on the balcony acting up.

“At some point friends must have come outside and they got down and came back inside and then came back out again. This time they started doing it again.

“You see people on the balcony doing all sorts of things and I just felt it was one of those things and in a moment they will probably go back inside.

‘The last thing I expected was to see them falling down. We just screamed.”

Mr Oguntayo ran to the scene and discovered both teens lying dead in a pool of blood.

Ms Tutik was a student at Bellerbys College, a private further education college which charges up to $40,000 a year.

Her devastated parents are reportedly on their way to London from Russia.

Scotland Yard said they were treating the deaths as a tragic accident.