In the aftermath, Nueva Ecija Rep. Edno Joson said the massacre might affect, or even lead to the cancellation of, the scheduled 2010 presidential elections. Candidates in the election condemned the massacre.
On Wednesday, November 25, 2009, the executive committee of the Lakas-Kampi-CMD political party unanimously voted to expel three members of the Ampatuan family - Maguindanao Gov. Andal Ampatuan Sr. and his two sons, Gov. Zaldy Uy Ampatuan of the Autonomous Region in Muslim Mindanao (ARMM) and Mayor Andal Ampatuan Jr. - from the party for their alleged role in the Maguindanao massacre. An emergency meeting of the Lakas-Kampi-CMD was held in Pasig, during which the Ampatuans were stripped of their membership.
On Thursday, November 26, 2009, Ampatuan Jr. surrendered to his brother Zaldy, was delivered to adviser to the peace process Jesus Dureza, then was flown to General Santos on his way to Manila, where he was taken to the National Bureau of Investigation (NBI) headquarters. Police in the Philippines charged Andal Ampatuan Jr. with murder. Ampatuan denied the charges, claiming that he was at the provincial capitol in Shariff Aguak when the massacre took place. He instead blamed the Moro Islamic Liberation Front (MILF), specifically Ombra Kato, as the mastermind, a charge the MILF dismissed as "absurd."
Mangudadatu successfully filed his certificate of candidacy at Shariff Aguak on November 27. He was accompanied by Lakas-Kampi-CMD chairman and presidential candidate Gilberto Teodoro, along with a caravan of 50 vehicles, to "ensure his safety."
On December 4, 2009 a number of homes belonging to the Ampatuan political family were raided in connection with the massacre.
[edit] Declaration of martial law
On December 4, 2009, through Proclamation No. 1959, President Gloria Macapagal Arroyo has officially placed Maguindanao province under a state of martial law. The declaration also suspended the privilege of the writ of habeas corpus in the province. The announcement was made days after hundreds of government troops were sent to the province, which would later raid armories of the powerful Ampatuan clan. Executive Secretary Eduardo Ermita said the step was taken in order to avert the escalation of "lawless" violence in the province and pave the way for the swift arrest of the suspects in the massacre.
Following the declaration, authorities carried out a raid on a warehouse owned by Andal Ampatuan Jr., the alleged mastermind of the massacre. The raid resulted in the confiscation of more than 330,000 live rounds of M16 rifle ammunition, and the arrest of 20 militiamen. Also confiscated in the raid were several firearms, a military humvee and an improvised armored vehicle.
