Three Britons accused of gang raping a woman in Singapore while visiting the city-state for a music festival face up to 20 years in jail and caning, court documents showed Thursday.

Khong Tam Thanh, 21, Le Michael, 23, and Vu Thai Son, 23, face one count each of raping a 23-year-old local woman in a hotel in the early hours of September 10.

According to charges seen by AFP, the three men allegedly took turns in raping the woman between 4:00am and 5:50am in a hotel room near the upmarket Orchard Road shopping belt.

They appeared via video-link from Changi Prison on Thursday and were offered bail of Sg$50,000 ($36,400)each. All were represented by lawyers in court.

Khong's lawyer Shashi Nathan told AFP that his client, a London-based businessman in the beauty industry, was in town for Ultra Singapore, an electronic music festival.

The men were charged with the offences on September 12 and have been held for investigations and a psychiatric review.

Nathan said Khong had a bailor and was expecting to be released later Thursday after proceedings are completed.

Le and Vu's lawyers said in court that their clients had trouble raising funds, asking that bail be lowered. The request was turned down.

Rape is punishable by up to 20 years in jail and caning, a punishment which dates back to British colonial rule in Singapore.

The men will next appear before the court on November 22.