NONTHABURI — Sobbing Thai students embraced each other tightly yesterday after a 14-year-old classmate entered their school wielding his grandfather’s handgun and shot dead at least five school staff.

Tearful students in school uniforms held each other outside the Debsirin Nonthaburi secondary school while emergency workers treated injuries and parents looked for their children.

“I’m still in shock,” 16-year-old Thatchai Jaiyen told AFP, expressing disbelief that a kind former teacher of his had been killed.

“She was such a good person. I thought that if she had encountered the shooter, she might have been able to reason with him.

“I never expected that the child would actually shoot her,” he said, his voice trailing away.

The suspect first killed his grandparents at their home around 20 kilometres (12 miles) away with the same firearm, according to authorities.

He took his own life after killing a maths teacher, a Thai language teacher, a guidance counsellor, a student affairs administrator and a secretary at the school, according to police.

Debsirin Nonthaburi secondary is among the most prominent government schools in Nonthaburi province, just north of the capital Bangkok.

Grade 12 student Pakonkiat Sangchan was studying when he said he saw the shooter walking towards the building.

“My friend suggested that we start running, so that’s what we did. We just ran,” the 17-year-old said.