PAW PAW, MI -- A 15-year-old boy is facing an updated list of charges related to a school threat, but the decision as to whether he will be prosecuted as a juvenile or an adult has been delayed.

The new charges include two counts related to explosives, replacing two original charges of attempted possession of explosives, Van Buren County Assistant Prosecuting Attorney Susan Zuiderveen said Thursday, March 29, during a court hearing.

The boy, wearing glasses and a sweater while being held in Allegan County, appeared before the Van Buren County court on a video screen.

He could face up to 28 years in prison if convicted on the charges, Zuiderveen said.

The charges stem from a threat against Paw Paw High School that caused the closure of Paw Paw Schools on Monday, March 19.

The teen nodded his head and answered Van Buren County Circuit Court Judge Jeffrey J. Dufon's questions while the teen's mother and attorney sat a few feet away from the screen at the courthouse. The teen said he understood the proceedings and had spoken with his attorney about what was happening.

The teen was arraigned Thursday on an updated list of charges, the most serious being count one, explosives - violation - vulnerable target, a 20-year felony.

He is also charged with a count of explosives - possession of bombs with unlawful intent, a 15-year felony, two counts of weapons firearms larceny, and six additional weapons charges.

The charges include four counts of felony firearm, each of which carry a 2-year consecutive penalty.

Besides the two explosives charges that replaced two original counts of attempted explosive possession, two additional felony firearm charges were added for the second arraignment, Zuiderveen said.

The charges were amended after officials investigated more evidence in the case, she said.

The teen's mother declined to comment about the case after the hearing.

Van Buren County Sheriff's deputies and Paw Paw Police investigated the threat Sunday, March 18, and the teen was arrested. Police obtained a search warrant for the teen's home on Oak Street in Paw Paw.

Sheriff Daniel Abbott has said the teen was found to be in possession of two stolen guns, material to make pipe bombs and Molotov cocktails. He said the teen's family was cooperative during the investigation.

Due to nature of the allegations, the teen remains in detention at the Allegan County Juvenile Center pending his next court date, Dufon said.

A new date will be set for the hearing to determine whether the teen will be designated as a juvenile or an adult, the judge said.