A man went on a shooting spree, killing his stepson and family, including a five-year-old girl, and wounding another man before taking his own life in Phayao on Tuesday night.
The rampage began about 8.10pm at a house in Chiang Kham district.
The gunman was 51-year-old Yuthana Riewsakulchart.
Yuthana went to the house alone, carrying a shotgun, and shot the four people who were inside.
Three people were killed. They were Pongthep Riewsakulchart, 37, his wife Supaporn Sae Chao, 34, and their daughter Kalayaporn Riewsakulchart, 5. Another man in the house, Songpol Kitkaranphit, 40, was wounded.
Pongthep was Yuthana's stepson. The gunman had married his mother.
Police said that after the killing spree Yuthana went to a helicopter landing pad, about 300 metres from the house, and shot himself dead with the same shotgun.
Local residents said that Yuthana and Pongthep had a conflict over a coffee business.
