An explosion at the guest room for retired military officials at King Mongkut hospital injured a dozen of elderly people.
It was not immediately known whether a surge in electricity caused the explosion or not, but all the injured were admitted to the emergency room for treatment.
There was no fire when it exploded.
Authorities are still investigating the cause as some said it was a gas explosion.
The incident happened at the first floor room in the Chalermphrakiat building.
Source: Thai Public Broadcasting Service (Thai PBS)