The explosion took place in the dispensary's waiting room, known as the Wongsuwon room, for commissioned officers at 10am. "The bomb used was a pipe bomb put inside a PVC tube that they placed inside a flower jar," he said. Government spokesman Sansern Kaewkamnerd said Prime Minister Prayut Chan-o-cha was informed about the incident by Deputy Prime Minister and Defence Minister Prawit Wongsuwon and the army chief, adding the prime minister called for people not to panic. Meanwhile, the bomb attack caused no panic among investors on the stock market. Army officers responded first to reports of an explosion at the hospital and cordoned off the affected area.

Source: Bangkok Post May 22, 2017 19:18 UTC