Mr Suthep made the announcement in a speech to supporters after he and PDRC core-members including Samdit Lertbut, Chumpol Julasai, Putthipong Punnakant, Akanat Prompan and Sakonthi Pattiyakul met for talks with Gen Apichart Saengrungruang, who is in charge of security at the Office of the Permanent Secretary for Defence.
A large number of PDRC protesters converged at the office, which is the temporary workplace of Prime Minister Yingluck Shinawatra. But the prime minister was nowhere to be seen at the office today.
Mr Suthep said he told Gen Apichart that the PDRC does not want Ms Yingluck to use the permanent secretary's office as her temporary workplace anymore because the government lacks the legitimacy to administer the country, particularly after using force against protesters at Phan Fah Bridge yesterday.
He said he also highlighted the government's mistakes, including problems with the rice-pledging scheme and nepotism in its appointment of government officials and asked Gen Apichart that the military stand on the side of the people.
"From now on we will escalate our protest to another level. If the government remains stubborn, we will attack businesses of the Shinawatra family. We will cut the pipelines to those businesses. Those who have invested in these businesses are advised to sell out their shares in them," Mr Suthep said.
He told people in Bangkok to call BlueSky television station if they happen to see Ms Yingluck, adding that the PDRC will go after her wherever she goes.