India, Aug. 7 -- A student suspected of carrying out the deadly school shooting in Thailand on Friday first shot dead his grandparents at their home before attacking his school near Bangkok, police said, revealing new details about the attack.

Apart from the shooter's grandparents, three students and three teachers were killed in the attack. According to police, the teen shooter, who was identified as a student at the school, died after turning the gun on himself.

Thai police said the gunman fatally shot his grandparents at their residence before heading to the school in Nonthaburi province, northwest of Bangkok, where he opened fire on students and teachers.

Authorities are continuing to investigate the motive behind both attacks. Pol...