Parents of 43 missing students in Mexico are demanding their safe return.<br/> <br />The trainee teachers disappeared a month ago in Iguala after clashes with police and are feared to be dead.<br/> <br />(SOUNDBITE) (Spanish) GISELA, MOTHER OF MISSING STUDENT JORGE ANTONIO TIZAPA, SAYING:<br/> <br />"We want our children back, that is our demand. That is what all the parents are demanding. We want our children back."<br/> <br />Four members of the Guerreros Unidos drug gang and dozens of officers have been arrested for alleged involvement in disappearances .<br/> <br />A manhunt continues for Iguala's mayor, his wife and the police chief.<br/> <br />The case has sent shockwaves across Mexico and sparked protests over apparent collusion between politicians, police and drug gangs.
