"The PDRC gives Ms Yingluck 24 hours to decide since PDRC secretary-general Suthep Thaugsuban made the announcement at 10.30pm yesterday (Dec 9).
"If she complies, the protests may end. If not, the PDRC will decide on the next step," PDRC spokesman Akanat Promphan, a stepson of Mr Suthep, said.
Mr Akanat said the anti-government protest on Monday was considered a true victory for the people. Even when Ms Yingluck announced a House dissolution on national television on Monday morning, the people did not retreat but continue to march to uproot the "Thaksin regime".
The Pheu Thai Party's decision to make Ms Yingluck candidate No 1 on its party list meant that the party was challenging the power of the people and it could lead to further unrest, he said.
"Ms Yingluck must do what she has said that she will do -- anything to bring about reconciliation -- by resigning as caretaker premier and not backing anyone to replace her," said the former Democrat Party MP.
He said protest leader Suthep had called on civil servants to side with "the masses". If they refuse there will be more measures from Mr Suthep.
PDRC core member Thavorn Senniam took to the stage near Nang Lerng intersection, telling the crowd that most civil servants had decided to side with the PDRC.
Witthaya Kaewparadai, another protest leader, said the PDRC will give civil servants, the army and police three days to decide if they want to join the anti-government protests.