The Amber Alert for two young boys believed to have been taken by their father, who is now the prime suspect in a triple homicide in Phoenix, has extended into Mexico.

The Phoenix Police Department said Sunday that an arrest warrant has been issued for the man suspected of taking his two biological sons after allegedly shooting and killing their mother and a man early Saturday morning.

Sgt. Armando Carbajal says investigators have developed probable cause to arrest Dimas Coronado, 47, on suspicion of three counts of homicide.

"An arrest warrant has been issued and he is considered armed and dangerous," Carbajal said in an email to Arizona's Family Sunday morning.

An Amber Alert for the two boys -- 8-year-old Victor Coronado-Nunez and 5-year-old Jonathan Coronado-Nunez -- was issued Saturday and remains active. The Amber Alert was issued in Mexico Monday.

This started with a double shooting at about 4:30 Saturday morning at a home in the area of 32nd Avenue and Van Buren Street in Phoenix.

[ORIGINAL STORY: Police: Suspect at large after shooting, killing man and woman in Phoenix]

The victims were identified as Oralia Nunez, 24, who is the boys' mom, and Omar Gonzalez, 34.

Nunez's cousin told Arizona's Family that Nunez was eight months pregnant. Police confirmed to Arizona's Family that the unborn child is the third homicide victim.

Phoenix police have issued an Amber Alert for two boys who are missing after their mother was killed in a double shooting in Phoenix early Saturday morning.

Police said Nunez's roommate came home from work to find Nunez and Gonzalez. Both had been shot and the boys, Victor and Jonathan, were nowhere to be found.

While Gonzalez was pronounced dead at the scene, Nunez was rushed to the hospital where she later died.

According to police, Nunez and Coronado had been married for nine years but have been living apart for the past few months. Investigators said there was a history of domestic violence.

A friend of Nunez's family said Nunez was afraid of Coronado because she was fighting for custody of Victor and Jonathan

Coronado was initially considered a person of interest in the case. He is now a murder suspect.

[PDF: Amber Alert flyer]

Coronado is described as 5 feet, 6 inches tall, weighing about 190 pounds with gray hair and brown eyes.

Jonathan is 3 feet, 6 inches tall and weighs about 45 pounds with black hair and brown eyes.

Victor is 4 feet tall and weighs about 60 pounds with black hair and brown eyes.

The Amber Alert included information about a white 2009 Chevy pickup. That truck was found not far from the shooting scene a few hours after the alert was issued. There was no sign of Coronado or the boys.

Investigators are now looking for a green Ford pickup truck with a white camper shell. The truck has a State of Chihuahua license plate with the number ZUD7164.

Nunez's family tells Arizona's Family that Mexican authorities have been advised to be on the lookout for Coronado and the boys.

Anyone having information regarding this case is asked to contact the Phoenix Police Department at 602-262-6151 or Silent Witness at either 480-WITNESS (948-6377) or 1-800-343-TIPS (8477). Spanish speakers may call 480-TESTIGO (837-8446). (Click or tap phone numbers to call from this story on your mobile device.)

24yo Oralia Nunez was killed overnight, her two boys are now missing. Her cousin tells me that she was 8 months pregnant. The boys may be in a light green Ford pickup, Mexico plates: ZUD-71-64 #AmberAlert #azfamily— Kim Powell (@KimPowellTV) September 2, 2018
The listed vehicle has been located in Phoenix. The children and person of interest remain outstanding. #AmberAlert is still in effect. If anybody has information regarding this case, please call the @phoenixpolice department or Silent Witness @480witness.— Phoenix Police (@phoenixpolice) September 1, 2018
The @phoenixpolice department is asking for the public’s help in locating these two children who were taken from their home. Their biological father is a person of interest at this time. Amber alert is in effect. #MissingPerson #AmberAlert— Phoenix Police (@phoenixpolice) September 1, 2018

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