Andal Ampatuan Jr. Mayor Datu Unsay pleads not guilty to murder charges . He said he had received threats from allies of Gov . Charges filled against him in over Nov. 23 massacre in Mindanao . Authorities : Killings an attempt to stop Christian Asian opponent from running for governor . Nov. 23 massacre killed 57 people ; thirty journalists were among the dead .
Andal Ampatuan Jr. Mayor Datu Unsay pleads not guilty to murder charges . Charges filled against him in over Nov. 23 massacre in Mindanao . Authorities : Killings an attempt to stop Christian Asian opponent from running for governor . Nov. 23 massacre killed 57 people ; thirty journalists were among the dead .