Northumbria Police and the North East Ambulance Service (NEAS) were called to Rochdale Way in Red House at 12.20pm today, Wednesday, July 14, following reports of a disturbance.
Police have said a group of armed men with blades went into a house and attacked a man inside, leaving him with non-life threatening injuries.
No arrests have yet been made over the assault and officers say they believe all those involved are known to each other.
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NEAS has confirmed it sent two hazardous area response teams (Hart) and a paramedic crew to the scene and treated a man for injuries to his head an arm before taking him to Sunderland Royal Hospital.
A series of cordons were put up in the area as police launched inquiries into the suspected attack, with a pool of blood left on the pavement close to the cut which links Redill Road with houses, a parade of shops and a grassed area.
The sections of tape have since been taken down, but a heavy police presence remains in the area, which is just a short distance away from a primary school, with house-to-house inquiries by officers under way.
A Northumbria Police spokesperson said: “At 12.15pm today we received a report of a disturbance on Rochdale Way, Sunderland.
“It was reported that a group of males who were in possession of a bladed article had entered an address and assaulted a male who was inside.
“Emergency services attended and found a male with non-life threatening injuries to his arm and head.
"He has been taken to hospital for treatment.
“An investigation has been launched into the incident.
"At present, officers believe all parties to be known to each other and there is no wider threat to the public.”
Anyone with information is asked to contact police via the Tell Us Something page of its website or by calling 101 quoting log NP-20210714-0504 or contact Crimestoppers anonymously on 0800 555 111.