He was responding to complaints by some officers who claim the difficulties they are facing in solving a bomb attack at Seacon Square on December 31 are due to the DSI's pressure and the expectations of the Council for National Security.

But Sunai said the DSI had even "backed off" from the investigation of all nine bomb attacks, at the request of the police.

"Since then we have never got in their way and have let them perform their work fully" he added.

Meanwhile, Phanuwat Khongthanayansakul, a lawyer representing two men who resemble two suspected bombers in police photos, said his clients were "considering" filing a civil lawsuit against police officers for making them "criminal suspects".

He said both Pratya Preechavej and Yutthaphong Kittisriworraphong were now also suffering financially and psychologically, adding that most of Pratya's business deals with clients had been suspended while Yutthaphong's job as a pub DJ had been terminated.

Both men are now under the protection of agents of the Justice Ministry's Rights and Liberties Protection Department and have been lent Bt100,000 by the department as part of a bail deposit of Bt400,000 for their temporary release from police custody.

Pratya said he would meet Prawet police next Monday to present more evidence in support of the two men's alibi that they "really did go" to the shopping complex on the day of the bombing but had nothing to do with the terrorist act as alleged by police.