The FBI agreed Wednesday to help an Arkansas prosecutor unlock an iPhone and iPod belonging to two teenagers accused of killing a couple, just days after the federal agency announced it had gained access to an iPhone linked to the San Bernardino gunman, according to ABC News.

Faulkner County Prosecuting Attorney Cody Hiland said the FBI agreed to the request from his office and the Conway Police Department Wednesday afternoon. A judge on Tuesday agreed to postpone the trial of 18-year-old Hunter Drexler so prosecutors could ask the FBI for help. 

The FBI announced Monday that it had gained access to an iPhone belonging to Syed Farook, who died with his wife in a gun battle with police after they killed 14 people in San Bernardino in December. The FBI hasn't revealed how it cracked Farook's iPhone. 

Hiland said he could not discuss details of the murder case in Arkansas, but confirmed the FBI had agreed less than a day after the initial request, reported ABC.

"We always appreciate their cooperation and willingness to help their local law enforcement partners," he said.

Drexler and Staton have both pleaded not guilty to capital murder, aggravated robbery and other charges in the deaths of the couple, who were both 66.

Patrick Benca, Drexler's attorney, confirmed that he was notified that the FBI had agreed to help unlock his client's phone.

"We're not concerned about anything on that phone," Benca said.