A 28-year-old man is to appear in an Indian court in connection with the rape and murder of a British teenager.

Police in Goa initially said Scarlett Keeling's death was an accidental drowning, but launched a murder investigation after the results of a second post-mortem showed she had been attacked.

The results also found she did not have enough water in her lungs to have drowned.

Samson D'Souza was detained after witnesses came forward alleging they saw him raping the 15-year-old on the beach at the resort of Anjuna on February 18.

He will also be questioned over the death of the teenager, from Bideford, Devon.

Under the Indian legal system D'Souza has to appear in court 24 hours after his arrest. He has not yet been charged with any offence.

Goa police official inspector Kishan Kumar said D'Souza would appear at the magistrates court in Mapusa some time on Monday.

"We have sufficient evidence to show this man was having sex with the girl in the early hours of February 18. We have established that he was raping her."

The police official added that Indian officers are now working on a murder investigation.

"This part of the investigation is still going on," he said.

Scarlett was on a six-month holiday in India with her mother, Fiona MacKeown, her mother's boyfriend, and six other children.

The rest of the family were travelling in a nearby state and Scarlett had stayed with a tour guide in Anjuna when she was last seen at a bar in the popular resort.

Ms MacKeown has spent the weeks since her daughter's death demanding an investigation and claiming that her daughter, who had 50 marks on her body, was murdered.

She said she would now fly her daughter's body home for a funeral and then return to Goa to keep pressuring the police in their investigation.

Goa is extremely popular with Western tourists but in the last few years there have been problems with tourists dying from drug overdoses and women especially being attacked and sexually assaulted.

According to the Times Of India, 126 foreigners have died in Goa over the last two years and in January this year a 30-year-old British woman was raped.