Original sentence: The 2015 Mamasapano clash or took place on Sunday, January 25, 2015 at Tukanalipao, Mamasapano,  Maguindanao was a battle between the Special Action Force (SAF) of the Philippine National Police (PNP) (allegedly joined by United States Army Special Forces and the Federal Bureau of Investigation) and the Bangsamoro Islamic Freedom Fighters (BIFF) and the Moro Islamic Liberation Front (MILF)
Edited sentence: The 2015 Mamasapano clash or Mamasapano massacre   took place on Sunday, January 25, 2015 at Tukanalipao, Mamasapano,  Maguindanao was a battle between the Special Action Force (SAF) of the Philippine National Police (PNP) (allegedly joined by United States Army Special Forces and the Federal Bureau of Investigation) and the Bangsamoro Islamic Freedom Fighters (BIFF) and the Moro Islamic Liberation Front (MILF)