GRAND RAPIDS, MI - The 17-year-old honor student accused of sending threatening messages to his classmates is back in jail after police say they discovered child pornography on his computer.

Matthew Robert Herrington, 17, is now charged with multiple counts of child sexually abusive material possession and distribution and illegal use of a computer. That comes in addition to the two counts of making a false report or threat of terrorism he was already facing.

In Grand Rapids District Court on Thursday, March 12, the teen and his parents saw Judge Jeanine Laville increase the suspect's $50,000 bond to $100,000 after hearing the accusations from the Kent County Prosecutor's Office.

The charges carry a maximum sentence of 20 years in prison.

Assistant Kent County Prosecutor Gregory Boer also showed the judge evidence that the boy's computer included statements that "demonstrated a threat to himself and others."

Laville said after looking at the statements gathered by Michigan State Police computer forensic investigators that it appeared the teen could be suffering from depression. She said while it is often difficult to determine if threats are serious or hyperbole, she was convinced that an increase in bond was necessary.

Herrington, an honor roll student, was arrested Feb. 22 at his home after Grand Rapids Police said he sent female classmates threats and Instagram photos of a male holding a gun.

The photos sent via Instagram include captions like "Don't come to school tomorrow," "you two will be the first," and "you will be number 5,'" according to police.

Police say Herrington confessed to holding the account where the photos originated and admitted he was trying to scare the victims, but did not intend to follow through on the threats.

Related: Catholic high school student accused of threats told classmates 'You two will be the first,' police say

While investigating the threats, police say they came across the explicit child images.

In court Thursday, defense attorney Anthony Greene told the judge that Herrington continues to maintain his 3.7 GPA as his school has provided him with assignments he completes off-site and returns.

The teen's parents raised the original $50,000 bond that allowed him out of jail, where he has been returned now on the $100,000 bond.

Greene said the teen is under the care of a doctor and said he has been following all the terms of his bond, which include only computer work under strict supervision.

"Everyone is trying to get an understanding of what is happening here," Greene said.

Herrington is due back in court later this month where a judge will decide if there is enough evidence to send the case to Kent County Circuit Court for felony proceedings.

E-mail Barton Deiters: bdeiters@mlive.com and follow him on Twitter at twitter.com/GRPBarton or Facebook at facebook.com/bartondeiters.5