Suthep Thaugsuban, the anti-government leader of the People's Democratic Reform Committee (PDRC), said the leaders of army, navy, airforce and police agreed to meet him and other protesters on Saturday to hear their political plans.
He claimed the mass movement would have won the battle against the government on December 9 when protesters held city-wide demonstrations but he had underestimated caretaker Prime Minister Shinawatra's "stubbornness".
"Anything that has gone wrong because of my miscalculation [of Ms Yingluck] I apologise for as I know pretty well that you all have waited for victory several times," Suthep said addressing the protesters here.
"Justice is the most significant factor in solving the problems," he said.
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The politically powerful army has staged or attempted 18 coups in the past 80 years, including the ousting of Yingluck's brother, Thaksin Shinawatra, in 2006.
On Monday, Yingluck was forced to dissolve the lower house of the parliament and call an early election by February 2 as 160,000 protesters gathered around her office. The numbers on the street have dwindled considerably since the announcement.
The protesters, led by former deputy premier Suthep, accuse Yingluck of acting as a proxy for her fugitive brother Thaksin.