The incident occurred in the early hours of yesterday (Nov 17), police confirmed.
The man, later identified as Chuaib Phongthin, 48, from Phang Nga, entered the police station shortly after 2:50am apparently in a "state of distress".
He kicked open the door of an office, and Pol Lt Col Akkarapol Siwilai, an investigating officer on duty, attempted to intervene.
Chuaib attacked Pol Lt Col Akkarapol Siwilai with a knife, leaving him with injuries above his left eyebrow and on his left arm.
Chuaib then fled the scene.
Pol Lt Col Akkarapol Siwilai was taken to Bangkok Hospital Siriroj where his wounds required eight stitches in total to close.
Police later discovered Chuaib had been involved in an accident in Phang Nga and admitted to Phang Nga Hospital.
Officers from Tha Chatchai Police soon arrived at the hospital and placed Chuaib under arrest.
According to Phuket Provincial Police Commander Pol Maj Gen Sinlert Sukhum the attack stemmed from an earlier case.
On Nov 8, Chuaib was arrested on an outstanding warrant related to property damage.
On Saturday (Nov 16), Chuaib and his relatives returned to the police station, questioning the legality of his arrest.
Chuaib and his relatives were told that Chuaib was arrested on an outstanding warrant.
During this visit, Chuaib reportedly became agitated and “delusional”, and started yelling, police said.
At the request of officers at the station, Chuaib’s family took Chuaib for some form of treatment at Thalang Hospital, police reported.
Hours later, Chuaib returned to the station with a knife, leading to the attack on Pol Lt Col Akkarapol.
After Chuaib’s subsequent arrest in Phang Nga, police discovered he had a history of mental health treatment, as confirmed by his relatives, Maj Gen Sinlert said.
Region 8 Police Commander Pol Lt Gen Surapong Thanomchit is aware of the incident, and Pol Maj Gen Sinlert said he has personally overseen the investigation.
He had visited Pol Lt Col Akkarapol to offer support.
“The officer’s condition is stable, and we expect him to be discharged from the hospital soon,” Pol Maj Gen Sinlert said.
Chuaib has been charged with attempted murder of an officer on duty and with causing damage to government property.
He remains in custody as police continue their investigation.