Thai police are preparing arrest warrants against three other key leaders of the ongoing anti- government rally, following one already approved for former Democrat MP Suthep Thaugsuban.

Arrest warrants are sought against Anchalee Paireerak, Samran Rodpetch, and Satit Wongnongtaey for fomenting chaos, government spokesman Teerat Ratanasevi was quoted by the Nation newspaper as saying on Wednesday.

On Wednesday, Suthep's lawyer petitioned the Criminal Court, which approved the arrest warrant for Suthep on Tuesday, to annual it.

Protestors targeted state offices for the third consecutive day, and laid siege to ministries of industry, energy, labor, public health, and commerce.