DSI director general Tarit Pengdith said the investigators are preparing the documents and reviewing the petitions to seek court's approval for arrest warrants for 33 leaders of the People's Democratic Reform Committee (PDRC) who failed to appear before DSI investigators to acknowledge charges related to their anti-government protest without appropriate reasons.
He said the DSI would postpone the original plan to submit the petitions from today to tomorrow at 9am to allow investigators to examine the documents.
Mr Tarit said the tripartite working committee comprising the DSI, the Attorney General's Office and police have mutually agreed that it was unnecessary to re-issue the summons as the protest leaders continued to violate the law.
They also announced holding mass rallies as the "Bangkok Shutdown" on Monday which would severely damage the economy, he said.
The PDRC planned to organise demonstrations at seven major locations in Bangkok to paralyse the capital to pressure the caretaker government to resign, opening the way for political reform before general election.