Authorities in Arizona were responding Tuesday to a shooting involving the U.S. Border Patrol.

The FBI told Fox News Digital that it was investigating an alleged assault on a federal officer that occurred around 7 a.m. near Arivaca, Arizona, just miles from the southern border. 

“The subject was taken into custody,” the agency said. “This remains an ongoing investigation. No further information will be provided.”

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U.S. Border Patrol Search, Trauma and Rescue (BORSTAR) agents from the Tucson Sector and Air and Marine Operations (AMO) participate in a demonstration of the rescue of a migrant lost in the Brown Canyon desert near Sasabe, Arizona. Authorities on Tuesday were investigating a shooting involving the Border Patrol in Arizona.  (HERIKA MARTINEZ/AFP via Getty Images)

The Pima County Sheriff’s Department said it was coordinating with the FBI and U.S. Customs and Border Protection.

The shots were fired near milepost 15 on Arivaca Road, according to the Santa Rita Fire District (SRFD).

Emergency responders from the Santa Rita Fire District (SRFD) and American Medical Response arrived at the scene around 7:30 a.m. and found one person in critical condition, KVOA reported. 

The patient was taken to a local hospital via medical helicopter. 

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This photo shows a US Border Patrol patch on a border agent’s uniform in McAllen, Texas, on January 15, 2019. (SUZANNE CORDEIRO/AFP via Getty Images)

Fox News Digital has reached out to the fire district, U.S. Customs and Border Protection (CBP) and the Department of Homeland Security.

Details about the circumstances of the shooting have not been disclosed. 

PCSD is conducting a parallel investigation and is leading the use-of-force investigation involving the agent, officials told the news outlet.  

“Such requests are standard practice when a federal agency is involved in a shooting incident within Pima County and consistent with long-standing relationships built through time to promote transparency,” PCSD said. 

Tuesday’s shooting was the second involving Border Patrol personnel in recent days. Alex Pretti, 37, was fatally shot by USBP agents during a confrontation in Minnesota as federal authorities were conducting enforcement operations. 

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It also came weeks after Renee Good was shot and killed by a U.S. Immigration and Customs Enforcement (ICE) agent while allegedly attempting to ram him with her vehicle in Minneapolis. 

Both deaths have triggered citywide protests and unrest, and violent confrontations between federal authorities and anti-ICE agitators.