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A student opened fire at a high school outside Bangkok on Friday, killing at least five people and wounding more than 20, according to authorities, who said he also appeared to have killed his two grandparents at the family home earlier in the morning.
The 14-year-old shooter took his own life at the school, officials said.
Five school staff members, including teachers and administrators, died in the shooting around 10 a.m. at Debsirin Nonthaburi School in Nonthaburi province northwest of Bangkok, Deputy Interior Minister Polapee Suwunchwee said at the scene.
The boy also killed his grandparents at the home he shared with them prior to the school shooting, Polapee said.
Bangyai Hospital, about 3 miles from the school, said 23 people were wounded, of whom 10 were in critical condition, with most suffering gunshot wounds. Earlier reports gave conflicting casualty numbers.
A witness said students hid inside a classroom while they heard gunshots from another building before police officers knocked on the door and cleared a way for them to leave the building.
Amporn Niamfuang, who owns a restaurant 160 feet from the school, said there was the sound of a single gunshot and then a pause.
“And then there were multiple continuous shots,” Amporn said, recalling the narrow road outside the restaurant filling with fleeing students. “Students were running scared and pouring onto the street. Young girls were holding each other’s hands and crying. I went inside to hide.”
Wason Wanichakorn 
Prime Minister Anutin Charnvirakul, speaking after touring the school, confirmed reports that the shooter was 14 and had killed himself. He said the student had shown signs of stress connected to school.
The gun, described by police as small and compact, was legally registered to his grandfather, he said.
Thailand has one of the highest rates of gun ownership in Asia, second only to Pakistan and far surpassing its Southeast Asian neighbors.
Data collected in 2017 by the groups Small Arms Survey and GunPolicy.org in their last extensive international study found civilian gun ownership in Thailand was about 15.1 guns per 100 people, compared with less than one per 100 in neighboring Malaysia.
