The Thai army looks to have taken the initiative in the battle with thousands of anti-government protesters who have occupied central Bangkok.
The heaviest fighting is in the Bon Kai area of the city, leading to the main business district.
More than 20 have died over the last three days and scores have been injured.
The government has rejected protesters’ calls for UN-supervised talks to end the crisis.
A state of emergency has been extended to a further five rural provinces, curbing activity in the protesters’ stronghold.
The military now say a curfew will not be imposed in flashpoint areas of Bangkok, as it is not yet needed.
And officials have asked the Red Cross to help evacuate the red-shirts fortified camp in Ratchasprong by a Monday deadline.
Some children, women and the elderly have reportedly already begun to shelter in a temple inside the camp.
Those outside the camp’s barricades can only watch and wait.
Several protesters and soldiers have been injured in escalating clashes in Bangkok, the Thai capital.
Thai troops fired live rounds and tear gas directly at protesters, known as “red shirts”, at a bridge next to the regional UN headquarters, wounding at least one in the arm, a Reuters’ photographer reported on Saturday.
“Riot police have clashed with protesters and have fired tear gas at them. Shots have also been fired,” Al Jazeera’s Wayne Hay, reporting from Bangkok, said.
“Red shirts have won this battle and have been able to push the military back – the military have now turned around and gone down the road.”
Emergency forces reported that more than 93 people, including 22 soldiers and police, were injured in the clashes as the tensions escalated in the biggest confrontation after weeks of mass rallies.
“The army will not kill Thais but we have to restore law and order,” Sansern Kaewkamnerd, the army spokesman, said.
He said that two soldiers have been shot during clashes with demonstrators, many of whom support Thaksin Shinawatra, the ousted former prime minister.
Troops had been ordered to reclaim the Phan Fah bridge and Rajdumnoen Road area, near several government and army buildings in the Thai capital.
There were about 4,000 protesters, including women and children, left in the area and the troops had about 200 metres to clear before they get to the main stage, Sansern said.
Hundreds of troops also massed at a downtown protest site, apparently ready to move in, and the crowd was growing by the hour.
“This is an explosive situation but both sides know that violence, like what happened in Kyrgyzstan, is not an option,” Supong Limtanakool, professor at Bangkok University, told Al Jazeera.
“The side that starts the violence will be condemned. Thaksin has a chance to show that he has the country’s best interests at heart, by reaching a negotiation with the government.”
Thai troops earlier used water cannons to repel anti-government protesters from an army base in central Bangkok, local television reported.
The protesters stormed the base near the Phan Fah bridge in the Thai capital on Saturday but did not enter it, local PBS channel has reported.
Government forces maintained a heavy presence at the television station they retook control of after claiming that the opposition channel was using it to incite violence.
The move came just hours after protesters had stormed the station and forced the reversal of an earlier decision to ban the channel.
The protesters have warned they will launch serious retaliation against the government but Abhisit Vejjajiva, the prime minister, has vowed not to bend to their demands that he relinquishes power and calls for fresh polls.
“The prime minister does not rule out negotiation with them but in order to do that they need to respect law and order first.”
Nattawut Saikua, a red shirt leader, told a cheering crowd on Friday night at the commercial district rally site that the routing of the troops at the station was “a major victory”.
Nattawut is one of some two dozen red shirt leaders for whom arrest warrants have been issued. So far, none have been taken into custody.
The Thaicom Pcl satellite station, which relays the People’s Channel signal via satellite, was founded by Thaksin.
Panitan Wattanagakorn, a spokesman for Abhisit, told Al Jazeera from Bangkok that the station was closed because it was airing misleading information that the government would use force to crush the people.
The authorities had taken over the channel on Thursday, triggering some 12,000 protesters to move to the station in the suburb of Pathum Thani, about 50km north of Bangkok, on Friday.
Sansern Kaewkamnerd, an army spokesman, said security forces stood down “because we did not want any loss of life or to hurt anyone”.
More than 4,000 soldiers retook the satellite transmission complex late on Friday after Abhisit ordered that the People Channel be blocked again.
“The station is inciting violence and spreading false information and rumours to the detriment of the country,” Sansern said.
On Wednesday, Abhisit’s government declared a state of emergency, allowing it to impose curfews, ban public gatherings, censor media and detain suspects without charge for 30 days.