( CNN ) -- Police are investigating the gang-rape of a tourist in central India , the latest black eye for the country over violence against women . A Swiss couple was camping near a forest in India 's Datia district when a group of men beat the husband and raped his wife , the district 's deputy superintendent of police , R.S . Prajapati , told CNN . There were between five and seven attackers , he said . The couple arrived in Mumbai on February 3 and were on a cycling tour across the country , said D.K . Arya , deputy inspector general of police . The attackers stole a laptop , 10,000 rupees ( US $ 185 ) and a mobile phone , he said . The victims went to police and the woman was hospitalized and later released . Twenty people have been detained for questioning , Arya said . The couple is staying at a guesthouse in the Datia district while the investigation unfolds , he said . The Swiss ambassador to India , Linus von Castelmur , has spoken with the couple and offered any support they will need . `` Their health and treatment is the priority of the moment , '' the ambassador said in a statement . `` The embassy has also been in touch with the local authorities and has requested for swift investigation and for justice to be done . '' The attack comes at a time in India when there are calls for stricter laws on sexual assault and changes in cultural attitudes toward women . In December a 23-year-old woman was gang-raped on a New Dehli bus , spurring protests in India , where most women have stories of sexual harassment and abuse on public transportation or on the streets , according to the Indian Council on Global Relations . That woman later died in a Singapore hospital . A panel appointed by India 's home affairs minister as a result of the case criticized Indian attitudes toward sexual assault and called for policy changes , including creating an offense of gang-rape punishable by at least 20 years in prison , making it a crime for police to fail to investigate sexual assault complaints and making it illegal to consider character or previous sexual experience of the victim at a criminal trial . Turkish police identify suspect in U.S. tourist 's death . Slaying highlights violence at Mexican tourist hotspot . CNN 's Per Nyberg contributed to this report .
NEW : Swiss government calls for swift investigation . Police say a woman was gang - raped in central Zurich . The victim and her husband were camping . 20 people have been detained for questioning .