He was later identified as Itthiphol Imphueng, 31, from Udon Thani’s Nong Wua So district, who worked at a slaughterhouse in Muang district, reports the Bangkok Post.
Police said the man drove a motorcycle around the town and attacked people at random.
The first victim was Anchaya Boonyingyuan, 16, whose neck was slashed by Mr Itthipol on Si Chom Chuen road behind the provincial central prison. The girl was rushed to Udon Thani Hospital where she was pronounced dead.
The second was a 22-year-old woman, Cholada Hinkham, from Muang district, who was attacked on Surakan road. She was stabbed in the neck and died on the spot.
Mr Itthipol then went on to stab four other women and a 13-year-old boy at different spots along the roads.
Police launched a manhunt and spotted Mr Itthipol at the five-way intersection with a clock tower on Prajak road. He was chased by police and a large number of people. He was finally caught and brought to the police station.
Mr Itthipol appeared to be high on drugs and gave a confusing statement during an enquiry.
He was initially charged with premeditated and attempted murder.