The Mexican military has arrested a suspect in the killings this month of three people with ties to the U.S. Consulate in Ciudad Juarez, Mexico, a federal spokesman said Monday.

"The only thing that I can say is we can confirm someone was arrested," spokesman Enrique Torres said. "The attorney general will give more details soon."

The suspect was arrested sometime Friday, Torres said. The person was not identified, but was described as being 42 years old and a member of the Aztecas, a local street gang affiliated with the Juarez drug cartel.

The Chihuahua state attorney general is telling us that this guy is implicated in the killings of Arthur Redelfs and his pregnant wife, Lesley  (Enriquez)," municipal police department spokesman Jacinto Seguro told CNN.

Local newspaper El Diario reported that the suspect was captured with the help of the FBI.

An FBI spokesman in El Paso, Texas, had no comment other than to say that the investigation continues.

The three victims had all been at a party in Juarez and left in two vehicles that looked similar. They were killed on the roads in drive-by  shootings.

Two of the victims were four-months-pregnant Lesley Ann Enriquez, an employee of the consulate in Juarez ,and her U.S. citizen husband, Redelfs, who was a jailer in El Paso. The couple's 10-month-old child, who also was in the vehicle, was not injured.

The third victim, found dead in the other vehicle, was identified as the husband of a Mexican employee of the consulate. His wife was not traveling with him, but two of their children in the car were wounded, officials said.

- CNN's Carol Cratty contributed to this report.