NEW : Martial law invoked to impose peace on the region after unrest . Among the victims in the massacre were the wife and sister of political candidate Ismael `` Toto '' Mangudadatu , who had sent the women to file paperwork allowing him to run for governor of Maguindanao . This follows killings of 57 people last week in province of Maguindanao . Security forces raided the home of Andal Ampatuan Jr. , son of Datu Unsay . Authorities say he Jr. ordered the November 23 politically motivated attack .
NEW : Martial law invoked to impose peace on the region after unrest . This follows killings of 57 people last week in province of Maguindanao . Security forces raided the home of Andal Ampatuan Jr. , son of Datu Unsay . Authorities say he Jr. ordered the November 23 politically motivated attack .