Former EGAT engineer allegedly in possession of bomb components.
A 62-YEAR-OLD man has been arrested on suspicion of planting an explosive device at the Phramongkutklao Hospital on May 22 that left 25 people injured.
Authorities yesterday identified the suspect only as "Wattana", a former electrical engineer at the Electricity Generating Authority of Thailand (Egat).
The suspect was taken into military custody and interrogated at the 11th Military Circle command in Bangkok yesterday. He denied any involvement with the explosion at the military-run hospital, according to a source.
A search of the suspect's home in the Ram-Indra area of Bang Khen district allegedly yielded four improvised explosive devices in PVC pipes "ready to be used", according to another source in the investigative team.
The source said many integrated-circuit timers similar to ones used in the explosive devices that were set off in two previous incidents - outside the old Government Lottery Office building on Rajdamnoen Avenue on April 5, and in front of the National Theatre on May 15 - were found.
A wall clock with the image of former prime minister Thaksin Shinawatra was also allegedly found in the suspect's house.
The search at the Bang Khen house involved more than 50 police and military officers, the Thai News Agency reported yesterday.
Searches also were conducted at 10 other locations in Bangkok and in surrounding provinces but no suspicious materials had been found, the police source said.
According to a source familiar with the investigation, Wattana was believed to be the man who took a fabric bag containing the explosive device concealed in a vase into the hospital's waiting room where the bomb exploded. He was in the room for about 10 minutes before leaving without the bag.
Security camera recordings at the hospital showed the person of interest as a thin, long-haired man about 160 to 165 centimetres tall.
The explosion at the hospital was the third to occur in Bangkok within two months. The homemade bomb planted at Phramongkutklao Hospital exploded and injured 25 people on the third anniversary of the 2014 military coup that brought down the elected government of Yingluck Shinawatra, Thaksin's younger sister.