Security officials have detained a 51-year-old woman for questioning after she was found to be a person who sent three letters warning of bomb attacks at two government agencies located near Phramongkutklao hospital one month before the hospital bombing.
The three letters were sent separately to the National Cancer Institute and the Prasat Neurological Institute warning them of bomb attacks.
Both institutes are located in Phayathai area not far from Phramongkutklao hospital.
The identity of the woman was not disclosed but she was invited by the military security officials to the 11th Army Regiment for questioning.
The woman was taken from her home in Prawes area in the eastern suburb of Bangkok.
The three letters were hand written and sent to the two institutes one month before the Phramongkhutklao bomb explosion.
The woman reportedly denied any involvement in the bombing, and also the three letters.
Meanwhile the Royal Thai Police deputy commissioner Pol Gen Srivara Rangsiphramanakul yesterday called a meeting of investigators looking into the hospital bombing.
The meeting was to evaluate information collected over the weekend, which included a simulation of the attack.
Source: Thai Public Broadcasting Service (Thai PBS)