Hundreds of people in Mexico have begun a march demanding better protection for migrants.<br /><br />They plan to follow the route many Central Americans take to reach the United States. <br /><br />It's a perilous journey, with hundreds kidnapped and even murdered. <br /><br />Al Jazeera's Mariana Sanchez reports from the town of Arriaga, where hundreds set off every day, seeking a better life.
