Mothers search for missing children

Women from "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) displays photos of missing migrants as they ride a raft to cross to Guatemala from the Suchiate river in the border of Ciudad Hidalgo, Chiapas, south of Mexico December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION)

Women from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers), hold a Hondurian flag and photos of missing migrants after arriving at Tecun Uman on a raft, as they head for the Suchiate river in the border city of Tecun Uman, north of Guatemala, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION POLITICS)

Women from "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) display photos of missing migrants and a Guatemalan flag as they walk to the Suchiate river and prepare to cross in a raft to Guatemala, at the border of Ciudad Hidalgo, Chiapas, south of Mexico December 18, 2013. According to organizers, the group, which is made up of relatives of people who went missing while making their way to the U.S., went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION)

A television journalist speaks to the camera on a raft along the Suchiate river, after the arrival of the women from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) to the border city of Tecun Uman, north of Guatemala, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (GUATEMALA - Tags: CRIME LAW SOCIETY IMMIGRATION MEDIA)

Women from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers), with photos of missing migrants and a Guatemalan flag (L), walk to the Suchiate river, to ride a raft to crossover to Guatemala, in the south border of Ciudad Hidalgo, Chiapas, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION POLITICS)

Women from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) display photos of missing migrants as they walk to the Suchiate river and prepare to cross in a raft to Guatemala, at the border of Ciudad Hidalgo, Chiapas, south of Mexico, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION)

Women from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers), with photos of missing migrants, arrive at Tecun Uman in a raft from the Suchiate river in the border city of Tecun Uman, north of Guatemala, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (GUATEMALA - Tags: CRIME LAW SOCIETY IMMIGRATION POLITICS)

Women from "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) ride a raft to cross to Guatemala from the Suchiate river in the border of Ciudad Hidalgo, Chiapas, south of Mexico, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION POLITICS)

Women from "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) ride a raft as they cross to Guatemala from the Suchiate river in the border of Ciudad Hidalgo, Chiapas, south of Mexico December 18, 2013. According to organizers, the group, which is made up of relatives of people who went missing while making their way to the U.S., went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION)

Women from "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) displays photos of missing migrants and a Salvadorian flag as they ride a raft to cross to Guatemala from the Suchiate river in the border of Ciudad Hidalgo, Chiapas, south of Mexico, December 18, 2013. According to the organizers, the group which is made up of relatives of people who went missing while making their way to the U.S. went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: POLITICS CRIME LAW SOCIETY IMMIGRATION TPX IMAGES OF THE DAY)

A woman from the "Caravana de Madres Centroamericanas" (Caravan of Central American Mothers) displays photos of missing migrants as she walks to the Suchiate river and prepares to cross in a raft to Guatemala, at the border of Ciudad Hidalgo, Chiapas, south of Mexico December 18, 2013. According to organizers, the group, which is made up of relatives of people who went missing while making their way to the U.S., went to Mexico in the last two weeks to demand that the governments of Mexico and Central America stop the kidnappings and crimes committed by organised criminal groups against migrants. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY IMMIGRATION)