Some 150 soldiers from the 11th Infantry Regiment were deployed to support police unit in handling the clashes between red shirts and the anti-government protesters in Lak Si district on Saturday.
The combined forces will try to negotiate with both sides that have confronted each other near IT Square Center in the district, Lak Si district director Narong Jamfah said Saturday.
The protesters camped outside the Lak Si district office on Chang Wattana Road in their attempt to block delivery of ballot boxes to polling booths in the area.
The redshirts who supported the tomorrow snap election gathered from nearby areas and tried to enter the site reportedly to get out the ballot boxes from the district office.
Female and children protesters retreated into the district office buildings, leaving men and security guards at the gate.
During the confrontation, giant firecrackers were thrown into the protesters, injuring three people, including a reporter of Daily News newspaper.
A female reporter tweeted from inside a police booth near the site that somebody shot into the police booth where she and other reporters were hiding.
One of her photos showed a bullet hole at the glass window of the booth.