Two 16-year-old girls were sexually assaulted in a home invasion in Picton early on Sunday morning, police say.
Tasman region police spokeswoman Barbara Dunn said a 25-year-old Blenheim man had been arrested in relation to the incident.
He appeared in court on Monday and was in police custody. His name has been suppressed.
The man drove to the house about 3.45am on Sunday and went inside, Dunn said. She would not give details on how he got into the house.
The two girls were in the same bedroom when the man came in and sexually assaulted them, she said.
One of the girls lived at the house and they were being looked after by a man and a woman while her parents were away.
The carers were alerted when the girls started yelling.
The male carer managed to get the intruder out of the house and restrained him until the man broke free.
The woman called police and got the registration number of the intruder's vehicle as he drove away.
Police stopped the man in his car in Picton shortly after he left the house and arrested him, Dunn said.
He appeared in the Blenheim District Court on Monday charged with performing an indecent act on a girl under 16, burglary, drink-driving and driving while disqualified.
He was remanded in custody to reappear on April 8.
Dunn would not give any details on the assaults or whether the girls knew the man who had assaulted them.