Deputy army spokesman Col Winthai Suwaree said the probe was not complete, so it was too soon for police to lay the blame on one side. It could also instigate more conflicts.
The police accused armed security guards of the People's Democratic Reform Committee (PDRC) of starting the shoot-out with the red shirts on Saturday, citing the evidence which included bullet cartridges and ammunition found at the place the PDRC members were occupying during the gunfire.
Col Winthai disputed reports that weapons were fired from the area in front of IT Square.
The pro-government demonstrators had gone there as they were trying to get to the Laksi district office to end the blockade by Luang Pu Buddha Issara and his followers.
The images of ''the armed men'' at the intersection were taken because most cameramen and most people were at that spot, he said, adding that that was not sufficient reason for the accusation by the police.
The PDRC was at a police booth at the intersection when the clashes occurred.
"After talking to people and soldiers at the police booth, it's clear that the shots were also from the area in front of IT Square. After that both sides began an exchange of gunfire,'' he said.
The army dispatched soldiers from the 11th Infantry Regiment in nearby Bang Khen district to the area to end the clashes.