First Army Region commander said yesterday that the bombing at Phramongkhutklao hospital was carried out by a well organized group.
Lt-Gen Apirat Kongsompong speculated that their backers might be person or persons who are dissatisfied with the current political situation in Thailand.
He asked the public to denounce and condemn them as they had no place in civil society.
No one in the world will tolerate the unprecedented attack on a medical facility, he said.
He said everyone from the prime minister to the deputy prime minister and the commander-in-chief himself has been patient in not ordering a state of emergency.
He assured that security forces and he himself and soldiers under his command are ready and on standby for the word from his superiors.
He said the media should realize from news reports that there are many inscrutable groups all over the world, but he wouldn't point any fingers.
But in light of the recent spate of bombings, he said he has ordered that modifications be made to the location of closed-circuit TV
cameras around Sanam Luang Field.
Also 200 more closed-circuit TV cameras will be installed at strategic locations in the area. Thirty roving motorcycle patrols have also been ordered along with military checkpoints at all important landmarks in the capital, he added.
Source: Thai Public Broadcasting Service (Thai PBS)