Officers today stormed homes in Blyth as part of an operation to disrupt supply of the lethal drug.
The Chronicle joined Northumbria Police on raids at two homes in Hortondale Grove in Cowpen where two couples were arrested.
A convoy of police vehicles arrived at the street at around 8.30am.
As stunned neighbours watched on the two men and two women were lead out their homes in handcuffs and put into marked vans to be taken away for questioning. One woman shouted and swore loudly, kicking the side of the van as she waited to be taken away.
Officers then seized three cars from outside homes on the street.
Today's raids followed an investigation prompted by reports from the community.
Chief Supt Dianne Winship of Northumbria Police's Northumberland Are Command said: "We've carried out a full and thorough investigation and this morning's activity is a culmination of those inquiries. The action is in direct response to concerns raised by residents."
However, police have stressed that it was a small network being targeted this morning and they have seen no signs of a return to the level of drug taking that earned Blyth's reputation as heroin capital of the North East.
Chief Supt Winship added: "I'd like to stress that this mainly involves drug dealing which is specifically contained within Blyth amongst a small group of people."
In Hortondale Grove, a 48-year-old man was arrested on suspicion of conspiracy to supply Class A drugs, while a man aged 37 and a woman aged 32 are being questioned on suspicion of supplying Class A drugs.
A 28-year-old woman was arrested on suspicion of obstructing a police officer.
Raids were also carried out at Beaumont Street, Gladstone Street, Salisbury Street, Laburnum Avenue, Marlow Street, Ingoe Close and William Street,
At Beaumont Street a 46-year-old woman was arrested on suspicion of offering to supply Class A drugs, while at Gladstone Street a 26-year-old man was arrested on suspicion of conspiracy to supply Class A drugs.
At Salisbury Street a man, 38, was arrested on suspicion of supplying a Class A drug, and at Marlow Street a 24-year-old man was arrested on suspicion of the same offence.