Emergency responders stand outside a school following a shooting in the Bang Kruai district, Nonthaburi province. (AFP pic)BANGKOK : A teenage suspect killed his grandparents before shooting dead at least six more people at a school near Bangkok Friday, police said. First he shot dead his grandparents, using his grandfather’s handgun, then went to a secondary school north of Bangkok and killed three teachers and three students, national police said in a statement. The shooter was identified as a teenage student of the school and also reported dead, according to local media reports citing authorities. ‘How could this happen’Some reports said police officers had shot and killed the suspect, while others said he had died by suicide.