Grief and shock in Thailand after mass killing of children

Grief and anger have engulfed Thailand a day after the mass killing of children and adults at a preschool daycare centre by a former Thai police officer who went on a rampage of stabbing and shooting before he shot his wife, child, and himself.
At least 22 children are among the dead.
It's one of the worst attacks in Thailand's history.
Al Jazeera's Tony Cheng reports from Nong Bua Lamphu, Thailand