The Bangkok Military Court on Monday approved warrants for the arrest of three more suspects in the grenade attack on the parking area in front of the Criminal Court on Ratchadapisek Road on Saturday night.
The three suspects named in warrants include two women, identified as Natthapat Onming, 56, and Tatchaphan Pokkrong, 20, and a man identified as Veerasak Towangchorn.
They are wanted on charges including attempted murder, causing an explosion that could hurt other people or might damage other people's property, and having illicit weapons and explosives in possession.
Police sought court approval for their arrest after obtaining information about them from Yutthana Yenpinyo and Mahahin Khunthong, who were arrested shortly after an RDG5 grenade was thrown by Mr Mahahin into the Criminal Court's parking lot on Saturday night.
Mr Yutthana, who was shot four times in the body by soldiers in an exchange of gunfire when he resisted arrested, is being treated at Phra Mongkutklao Hospital. Mr Mahahin is being held for questioning at the 11th Infantry Regiment headquarters. Both of them are being detained under martial law.
Pol Lt Gen Prawut Thawornsiri, the assistant police chief and police spokesman, said the grenade attack on the Criminal Court was carried out by a different group of people, not related to the other group that earlier laid bombs on a walkway near the Siam station of the BTS skytrain.
On Mr Mahahin's claim that Ms Natthapat, who was his girlfriend, knew Gen Chaiyasit Shinawatra, a former supreme commander, and Pol Lt Gen Kamronwit Thoopkrachang, a former metropolitan police chief, Pol Lt Gen Prawut said police interrogators were considering whether to invite the two in for questioning.
Mr Mahahin told police during the interrogation that Ms Natthapat was his girlfriend and Ms Tatchaphan was Mr Yutthana's girlfriend.