Thailand's Deputy Prime Minister Gen Yuthasak Sasiprapha said Thursday that the three explosions in downtown Bangkok on Tuesday were a security issue and there was no evidence to classify them as a terror attack, the online edtion of The Nation newspaper reported.

"The government views the blasts as having impacted on the national security," The Nation quoted Yuthasak as saying.

The explosive devices undercovered were aimed for individual targets and the blasts involving Iranian bomber suspects were individual crimes and not a terrorist attack, Yuthasak said, reaffirming statements of National Security Council Secretary- General Wichean Photephosree at a press conference on Wednesday.

The police investigation has yet to determine the motive why the suspects assembled the devices before the explosions, he said. The authorities had no evidence to link the suspects to the terrorist movement.

Three consecutive blasts occurred Tuesday in downtown Bangkok, injuring five people. Thai police have issued arrest warrants for four Iranian nationals on charges related to the blast.