Singer Amy Winehouse and her husband, Blake Fielder-Civil, have been arrested, in Norway, for drug possession.

Police detained the couple overnight after they were found with 7g (025oz) of marijuana. The award-winning musician, her husband and an unnamed British man were arrested at a hotel room in the southern city of Bergen.

They were held for 12 hours before being fined and released. The couple were ordered to pay 500 euros (£350) between them, while the other arrested man was fined £240.

Winehouse, 24, who was admitted to hospital earlier this year after a reported overdose of heroin, ecstasy, cocaine, ketamine and alcohol, is due to give a concert in Bergen tonight.

Prosecutor Lars Morten Lothe said: "We had a tip from a good source which led to police checking up on the tip."

He said the drug had been found in the room itself rather than on any of their persons.

"They signed a ticket, a fine, at the police station some hours ago," he said. "It is a closed case."

Following her hospital admission in August, Winehouse cancelled a string of concerts and reportedly entered a rehabilitation clinic. But the singer has since been pictured drinking alcohol and her behaviour has reportedly been erratic. Photographers have snapped her covered in blood and bruises with makeup smudged across her face. Pictures of Fielder-Civil covered in gashes have also been published.

Earlier this year the singer self-harmed during an interview with American music magazine Spin. The journalist reported that while being interviewed Winehouse used a shard of mirror to cut stomach.

Her mother, Janis Winehouse, has publicly said she no longer recognises her daughter. Last month the 52-year-old pharmacist told an interviewer: "Amy is playing Russian roulette with her health and musical gift. She's lost herself. We're not talking about my Amy. It's not someone I recognise. She has become her own stage creation."

"I knew she was smoking marijuana but not that she was doing class A drugs until she collapsed. She won't stop until she sees the point of stopping ... when I saw her afterwards, I did not tell her to clean up, there was no point.

Fielder-Civil’s father has said he believes his son and Winehouse are taking cocaine, crack and heroin and has asked fans to stop buying Winehouse’s music until the couple seek help. Giles Fielder-Civil has also criticised Winehouse’s record label for blaming her numerous concert cancellations on “exhaustion”.

“We believe that the record company should be proactive in helping the couple get better. They seem to be hiding behind a label that the pair aren’t drug addicts, they’re ‘exhausted’.

Winehouse made a comeback appearance at the Mercury Prize ceremony in London last month. Her acoustic performance impressed the audience but her subsequent appearances have proved less popular. At the Mobo awards late last month she appeared distracted and out of time with her band, and critics who saw her perform in Munich earlier this week, said the star seemed shaky, forgot her lines and appeared to be close to tripping over on stage.

Winehouse rose to fame in 2006 after her album Back to Black proved a critical and popular success.

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