Officers were standing guard outside the singer’s house in Jeffrey’s Place, Camden, north London, from around 5pm until 8pm on Thursday as others worked inside.

Amy, 24, and her husband Blake Fielder-Civil were both out at the time and police reportedly had to force open the door to gain entry.

Scotland Yard confirmed there was "police activity" at the property and said it was part of an "ongoing police operation".

A spokesman confirmed the arrests related to next week’s trial involving Blake, 25, and a second man, 39, who both face charges of grievous bodily harm.

But he refused to comment on whether Blake was one of the four suspects being held.

The trial concerns an incident on June 20 this year and is due to start on Monday at Snaresbrook Crown Court.

A spokesman for Amy would not give any details about the raid, but stressed that it was not related to drugs and that she is not involved.

He said: "The only thing I can tell you is that it has nothing to do with drugs and that Amy is fine and she has not been charged or arrested."

The raid follows a difficult few months for the singer, who has received critical acclaim for her music but been under intense scrutiny due to her erratic lifestyle.



Amy and Pete to perform at music awards - Nov 1 2007
The MTV Europe Music Awards are set to take place with Amy Winehouse and Pete Doherty among the star performers.

Amy Winehouse is a triple nominee, shortlisted for Best UK Act, Best Album (Back To Black) and Most Addictive Track (Rehab).

Her rivals in the album category are Akon, Avril Lavigne, Linkin Park and Nelly Furtado.

Best Solo Artist will be a battle between Justin Timberlake, Avril Lavigne, Christina Aguilera, Mika, Nelly Furtado and Rihanna.

JT leads the field with four nominations.

The ceremony is being held this year in Munich, Germany, and hosted by rapper Snoop Dogg.

Organisers lined up a host of glamorous guest presenters including Joss Stone and model Lily Cole.

But the most eagerly awaited appearance of the night will be by Doherty and his band Babyshambles.

The troubled singer should be on his best behaviour.

On Monday he was handed a suspended jail sentence for a string of drug and motoring offences.

The 28-year-old frontman received a four month sentence suspended for two years, plus an 18-month supervision order and a 12-month drug rehabilitation order.

Asked outside court if he was pleased, he replied: "You must be joking. I won’t be able to take drugs for two years."


Amy’s father fears for her health - Oct 30 2007
The father of singer Amy Winehouse has told of his ongoing fears for her health and claimed she did not touch hard drugs until she married Blake Fielder-Civil.

Mitch Winehouse told ITV1’s This Morning: "It’s apparent in her music that she’s smoked dope for quite a while, probably from the age of 16 or 17, perhaps even earlier.

"She was a complete opponent of hard drugs - in fact, she got up and said she couldn’t understand why people in the music industry took hard drugs and that changed about six months ago when she got married to Blake.

"And I’m not saying it’s Blake’s fault, what I’m saying is Amy’s responsible for her own actions.

"However, it’s a fact that the hard drugs coincided with their marriage."

Mr Winehouse said his daughter has cut down on her drinking in the past year but is still battling bulimia and drug addiction.