Their faces covered, witnesses, mostly relatives of suspects killed during an intensified police campaign against illegal drugs, wait for their appearance at a hearing on extrajudicial killings being conducted by the Senate committee on justice and human rights.   
  Four year old Datu Artel wears a Muslim headgear used in the Sagayan, a traditional Maguindanao war dance at the J. Marquez Elementary School of Peace, Cotabato City on March 18, 2015.