Bangkok, Aug. 7 -- The death toll in the school shooting at Debsirin Nonthaburi School in Thailand's Nonthaburi province rose to eight on Friday (local time), with 22 others injured, while the grandparents of the suspected teenage shooter were later found dead at their residence.

According to the Bangkok Post, the suspected shooter, a Grade 8 student at the school, was found dead inside the campus after the attack. Authorities later searched the suspect's home in Bang Bua Thong district and discovered the bodies of the teenager's 73-year-old grandfather and 74-year-old grandmother, both with fatal gunshot wounds to the head.

Investigators believe the grandparents were killed before the school shooting, though the exact sequence of event...