A man who allegedly abducted and raped a European tourist in South Australia may have attacked other victims, a court has heard.
The 52-year-old allegedly snatched and attacked the woman after responding to an advertisement she had posted online seeking work.
He was arrested at a property in Meningie, east of Adelaide, on Saturday and charged with three counts of rape and one count of unlawful detention.
But prosecutors told the Adelaide Magistrates Court on Monday that the man could have other victims.
"There is a belief that there may be other victims that may come forward," Brevet Sergeant Natasha Goode said.
"The investigation is alive. Obtaining evidence from the defendant's premises is still ongoing."
The man wore handcuffs and a blue T-shirt during his court appearance, and did not speak.
The alleged victim was found at a Murray Bridge property on Friday thanks to a tip-off from a member of the public.
During her ordeal, she managed to get a desperate message to her family in Europe as well as a friend in Queensland, and she was reported missing.
The 24-year-old had left her tourist accommodation in Adelaide's CBD on Thursday morning and boarded a bus to Murray Bridge.
From there it was thought she had been picked up by someone in a red ute, and police feared she had been kidnapped.
Police said she had posted an ad on the Gumtree website seeking work in Victoria, and her alleged captor had responded.
Neither the alleged victim or the accused man can be named for legal reasons.
Premier Jay Weatherill said the incident was a matter of grave concern and he hoped it would be investigated swiftly.
"These are awful incidents and we want to eliminate them entirely if we can," he said on Sunday.
Mr Weatherill said the government was also concerned at the message such alleged incidents sent to tourists.
"There's a significant reputational issue here," he said.
"But people should be rest assured that perpetrators of crime will be detected and they will be held to account."
The accused will return to court on Friday for a review of suppression orders.
