Story highlights Rogelio Martinez and his partner were responding to activity on patrol

Martinez had been a border patrol agent since 2013

(CNN) A Border Patrol agent died Sunday morning from injuries he suffered while on patrol in southwest Texas, US Customs and Border Protection said.

Rogelio Martinez, 36, and his partner were responding to activity while on patrol in the Big Bend Sector, which runs along the US-Mexico border, and the partner reported they were both injured, the agency said. The agents were patrolling near Interstate 10, in the Van Horn station area of the sector.

Customs officials would not say what type of activity the agents were responding to.

Other agents responded, provided medical care and transported both to a local hospital. CBP was later told Martinez had died, and his partner remains hospitalized. It was not clear what injuries they suffered. A Customs and Border Protection spokesman said Martinez was not shot.

"On behalf of the quarter of a million front line officers and agents of DHS, my thoughts and prayers go out to the family and friends of Agent Martinez and to the agent who is in serious condition," acting Secretary of Homeland Security Elaine Duke said in the statement.

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