The decision to hold in-depth probe was arrived at a meeting which PML President Shujaat Hussain and Secretary-General Mushahid Hussain had with the Prime Minister within hours of latter's return from Saudi Arabia.
The Prime Minister later on briefed President Pervez Musharraf about the crisis besetting the Sindh government.
The official press release on this meeting, however, made no direct mention of the crisis.
According to the release, the President and Prime Minister exchanged views on the political environment in the country. "The law and order situation as well as other important national issues also came under discussion during the meeting".
They expressed satisfaction over the peaceful conduct of Ashura-e-Muharram, expressing hope that the holy month would pass peacefully in a spirit of brotherhood, harmony and unity, the release added.
The Prime Minister also briefed the President about his visit to Saudi Arabia and his interaction with the Saudi and other world leaders who were there to attend the economic forum meeting, and his forthcoming visit to Iran.