Thousands of children making the dangerous journey to the United States are being held in Mexican shelters that are rapidly filling up, with some lacking basic necessities, Save the Children warned. The rising number of migrants and asylum seekers from El Salvador, Guatemala and Honduras hoping to cross the border with the U.S. included an increase of unaccompanied children. U.S. government figures show that in March alone,18,890 children were identified entering the US. The numbers of unaccompanied children rose sharply over the past months. From January to March of this year, 34,173 unaccompanied children were identified at the border between Mexico and the United States; an increase from 14,414 identified from October to December of last year. Some of these children were previously in Mexico with their families or with other people who wanted to cross the Mexico-U.S. border. But now, because of policy changes not to expel unaccompanied children, they’re being sent to the U.S unaccompanied, causing family separation and significant risks during border crossings.