Two Layton teenagers face an Aug. 25 preliminary hearing in Layton 2nd Circuit Court on attempted first-degree murder charges in the Aug. 8 shotgun attack on a Utah Highway Patrol trooper.

Jared Valentine, 18, 631 E. 20th North, and Michael Polete, 17, 610 E. 20th North, were arraigned in circuit court after being returned Monday from Elko, Nev., where they were picked up after a two-day manhunt.The teenagers are being held in the Davis County Jail on $25,000 bail each.

Arrest warrants charging them with attempted homicide, a second-degree felony, were issued Aug. 11, but the charges have now been upgraded by the Davis County attorney's office to attempted first-degree murder, a first-degree felony.

They are being held in the attack on UHP trooper John T. Mitchell in Layton. Mitchell attempted to stop a car he reported seeing run a stop sign. After a brief chase, a passenger in the car leaned out and fired a shotgun at the trooper's vehicle, disabling it.

Mitchell suffered minor injuries from flying glass when shotgun pellets went through the car's windshield and blew out the back window.

Polete and Valentine were arrested last weekend about 15 miles northwest of Wells, Nev., after they were spotted fleeing from a ranch house authorities said is owned by a relative of one of the suspects.

A manhunt was organized, and the two were found the next day and held in the Elko County Jail. They were returned to Davis County after they waived extradition.