Fifth child dies after arriving at US border from Guatemala since December

The boy was apprehended and processed near Hidalgo, Texas, on May 13 before being transferred to the Weslaco Border Patrol Station Sunday, the agency said in a statement. He was found unresponsive Monday morning. The cause of death is unknown, the agency said.

"The men and women of US Customs and Border Protection are saddened by the tragic loss of this young man and our condolences are with his family," said Acting Commissioner John Sanders in a statement. "CBP is committed to the health, safety and humane treatment of those in our custody."

This is the fifth child known to have died after journeying to the US in recent months from Guatemala and being apprehended by US authorities.

Last week, a 2-year-old boy from Guatemala died at a hospital in El Paso, Texas. The boy, who was not identified and was not in US custody at the time of his death, had suffered from complications of pneumonia, Tekandi Paniagua, the Guatemalan consul general in Del Rio, Texas, told CNN.

The deaths of two young Guatemalans in December spurred congressional hearings and new procedures from DHS and CBP. Jakelin Caal Maquin, 7, died of sepsis, a bacterial infection, in an El Paso hospital in December, two days after she and her father were detained. Weeks later, 8-year-old Felipe Gómez Alonzo died of flu complicated by sepsis while in Customs and Border Protection custody.

Late last month, 16-year-old Juan de León Gutiérrez died in a Texas children's hospital days after arriving at an Office of Refugee Resettlement shelter. The cause of his death hasn't been reported, though a source close to the situation said at the time that he showed signs of distress the day after he arrived at Casa Padre, a former Walmart in Brownsville, Texas.

Immigration authorities have since ordered an increase of medical checks for children in their custody, with a focus on children under 10, amid an uptick of migrants crossing the US-Mexico border.

In April alone, the Border Patrol arrested 98,977 migrants for illegal entry, many of whom were families -- an increase from the month before. Migrants from Central America often make the journey through Mexico under punishing conditions and with limited food and water.