Guatemalan boy who died in U.S. custody had the flu: officials

New Mexico authorities say an autopsy performed on the 8-year-old Guatemalan boy who died in U.S. custody shows he had the flu.

The New Mexico Office of the Medical Investigator says in a statement late Thursday that more tests need to be done before a cause of death can be determined for Felipe Gomez Alonzo.

Authorities say he died at a New Mexico hospital after suffering coughing, vomiting and a fever.

Homeland Security Secretary Kirstjen Nielsen is visiting the Texas border city where Felipe was detained with his father and later died.

DHS spokeswoman Katie Waldman said Nielsen is heading to El Paso on Friday. Waldman says Nielsen will tour multiple stations and substations operated by U.S. Customs and Border Protection. Nielsen is also scheduled to meet with emergency medical technicians and medical professionals, as well as local officials.

WATCH: A tearful mother mourns her son who died in U.S. custody.

0:43 Tearful mother grieves migrant boy who died in U.S. custody

Nielsen will go to Yuma, Arizona, on Saturday.

Felipe was the second Guatemalan child to die in CBP’s custody in three weeks.  Another Guatemalan child, 7-year-old Jakelin Caal, died in U.S. custody on Dec. 8. Both deaths are under investigation.

Nielsen has called Felipe’s death “deeply concerning and heartbreaking” and requested medical help from other government agencies.

WATCH BELOW: White House calls migrant boy’s death a ‘tragedy,’ slams Democrats over border security

1:07 White House calls death of migrant boy ‘tragedy’, slams Democrats over lack of action of border security