A law enforcement official tells CBS 5 News that investigators are looking into the possibility of friendly fire in Arizona Border Agent Nick Ivie's death.
No further information was immediately available.
CBS 5 News has also independently confirmed two suspects have been detained in Mexico in connection with his shooting death.
A highly placed source verified the pair were detained in Naco, Mexico.
Earlier, a Reuters' report said the suspects were detained in a Mexican military operation in the city of Agua Prieta, in Mexico's northern Sonora state, a few miles from the spot where Nicholas Ivie, 30, was shot dead early on Tuesday.
Another agent who was wounded has been released from the hospital.
CBS 5 News received a written statement late Wednesday afternoon from the Consulate of Mexico in Douglas, AZ. It said:
"The government of Mexico has been in constant communication with its U.S. counterparts since it received notification of the incident where a Border Patrol agent sadly lost his life, and offered and has been providing all its support in the investigations that are being carried out. Given that there is an ongoing investigation, we have no additional comment at this time." -Socorro Córdova, State Press Attaché, Mexican Consular Network in Arizona
The Cochise County Sheriff's Office released a statement Thursday. It said, "Still no confirmation of the arrests from Phoenix sector FBI, handling the investigation along with CCSO, itself waiting for an FBI confirmation."
Ivie's family held a news conference Thursday morning in Sierra Vista.
Kevin Goates, the family spokesman, said, "The Ivie family would like to thank all of those who have expressed their support and condolences as they deal with the loss of Nicholas, a father, husband, brother and son. Nicholas served both his country and his church with dedication and love and will be dearly missed by many."
Nearly 100 people gathered in Naco for a candlelight vigil for Ivie. Family members, law enforcement officials and local residents attended Thursday night's event.
The Sierra Vista Herald/Bisbee Daily Review said the organizer of the vigil was Rev. Seth Polley, who's the vicar of St. John's Episcopal Church in Bisbee.
Father Samuel Jandeh, vicar of St. Michael's Catholic Parish in Naco, said Ivie's death was more of a sacrifice than an ordinary death.
He said law enforcement officials expose themselves to danger and they deserve appreciation for it.
Funeral arrangements for the fallen agent have been announced. Visitation will be held Sunday, Oct. 7 from 6-8 p.m. at Hatfield Funeral Home in Sierra Vista. Funeral services will be 10 a.m. Monday, Oct. 8, at The Church of Jesus Christ of Latter-Day Saints, 2100 Yaqui St., Sierra Vista. Interment will follow at a later date in the Spanish Fork City Cemetery, Spanish Fork, UT.
Stay with cbs5az.com and CBS 5 News for updates on this developing story.
Copyright 2012 CBS 5 (Meredith Corporation). All rights reserved. The Associated Press contributed to this report.
Tuesday, April 22 2014 7:06 PM EDT2014-04-22 23:06:02 GMT
Jeffrey Wade Chapman wants a professional tattoo artist to remove or cover a prominent tattoo on his neck that reads "REDRUM" (murder backwards, so he can read it in the mirror) before he goes on trialMore >
Jeffrey Wade Chapman wants a professional tattoo artist to remove or cover a prominent tattoo on his neck that reads "REDRUM" (murder backwards, so he can read it in the mirror) before he goes on trial for first degree MURDERMore >
Tuesday, April 22 2014 11:52 AM EDT2014-04-22 15:52:19 GMT
Police in Hartford said a 2-month-old who was in critical condition after an incident last week has died.Adore Marie Daniels died Tuesday shortly after 4 a.m., according to Lt. Brian Foley of the HartfordMore >
Police in Hartford said a 2-month-old who was in critical condition after an incident on April 15 has died.More >
Tuesday, April 22 2014 5:55 PM EDT2014-04-22 21:55:28 GMT
Three dogs in Southington were treated Tuesday after they were attacked by a coyote on the nature trails off of Flanders Road. The dog owner, Jeff Burgess, called police around 7:30 a.m. on Tuesday toMore >
Three dogs in Southington had to be treated Tuesday after they were attacked by a coyote on the nature trails off of Flanders Road.More >
Tuesday, April 22 2014 6:21 PM EDT2014-04-22 22:21:10 GMT
A million people per year head to the emergency room for debilitating migraines, according to doctors. Some of those doctors said the butterbur plant, which can be purchased at a health food store, couldMore >
Doctors said the butterbur plant, which can be purchased at a health food store, could help prevent the pain.More >
Tuesday, April 22 2014 8:26 PM EDT2014-04-23 00:26:30 GMT
Connecticut lawmakers are attempting to modernize the state's "Do Not Call Registry" and include unsolicited text messages as well as phone calls. A bill that would add text messages to the list of prohibitedMore >
Connecticut lawmakers are attempting to modernize the state's "Do Not Call Registry" and include unsolicited text messages as well as phone callMore >
Tuesday, April 22 2014 8:55 AM EDT2014-04-22 12:55:21 GMT
State police issued a silver alert for a missing teen from Waterford Monday night.Ashley Tanguay, 16, was last seen Saturday.Troopers described her as having brown hair, brown eyes, standing 5'5" tallMore >
State police issued a Silver Alert for Ashley Tanguay of Waterford Monday night.More >
Tuesday, April 22 2014 2:24 PM EDT2014-04-22 18:24:56 GMT
Eyewitness News is giving $40,000 and you'll have two chances each week night to win!"This spring Channel 3 is making it rain money. We're giving away a total of Forty thousand dollars - CASH," said ChannelMore >
Eyewitness News is giving $40,000 and you'll have two chances each week night to win.More >
Wednesday, April 23 2014 4:15 AM EDT2014-04-23 08:15:15 GMT
The Naugatuck Police Department is investigating the untimely death of an infant Tuesday morning. Officers were called to residence on Diamond Street around 7 a.m. Connecticut State Police Major CrimeMore >
The Naugatuck Police Department is investigating the death of an infant girl Tuesday morning.More >