(CNN) A 16-year-old Guatemalan boy died in government custody Monday morning, Customs and Border Protection said.

The teen, identified by a CBP official as Carlos Gregorio Hernandez Vasquez, 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.

Vasquez crossed into the US with a group of about 70 people and was transported to the Central Processing Center in McAllen, Texas, to await transfer to the custody of the Health and Human Services Department, as is customary for unaccompanied minors.

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