Police investigating an alleged attempted murder following the appearance of a doctor in court has removed a cordon from an estate in Ingleby Barwick after four days. 

Officers first cordoned off Brading Court when they first swarmed the estate four days ago (February 5) following reports of an "unknown substance" but have since charged a Sunderland GP with attempted murder.

Two days into the investigation, in which time investigators were pictured wearing hazmat suits and protective gear going in and out of a home, the doctor was arrested on suspicion of attempted murder.

The Northern Echo: Brading Court.Brading Court. (Image: Terry Blackburn)

Dr Thomas Kwan has since appeared in court charged with the attempted murder of a man - believed to be his mother's husband.

He remains in hospital in serious but stable condition following a suspected poisoning in Newcastle last month.

The Northern Echo: Investigators at the scene on February 9.Investigators at the scene on February 9. (Image: Terry Blackburn)

A woman in her 30s was also later arrested on suspicion of attempted murder but has been bailed. 

A statement released by police tonight said: "Cleveland Police can confirm the searches at the property in Brading Court, Ingleby Barwick have now completed, and the cordon has been removed from the area. 

The Northern Echo: Brading Court, Ingleby Barwick.Brading Court, Ingleby Barwick. (Image: TERRY BLACKBURN)

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"We would like to thank all residents who were affected by the activity for their patience and cooperation."