Chilling details of a Manitoba teen's support for the terrorist group ISIS were heard in a Brandon courtroom Tuesday morning.

The teen is charged with a terrorism offence. In September, the teen pleaded guilty in Winnipeg to a charge of counselling the commission of an indictable offence for the benefit of, at the direction of or in association with a terrorist group.

Chief Federal Prosecutor for the Public Prosecution Service of Canada, Ian Mahon, outlined what led to the arrest of the the teen.

It stems from an investigation which began on Dec.17, 2014.

A news reporter from the CBC contacted RCMP with a tip about a Twitter account indicating a teenager was planning to leave Canada to fight with ISIS.

Mahon told court the Twitter account provided was later found to belong to the youth.

Court heard the account contained messages of support for Hijrah, which involves migration to Syria or Iraq.

Court also heard the account contained a post which asked anyone who couldn't make Hijrah to "strike from within."

Mahon described the post in court; "It doesn't matter how you do it, use a bomb, a knife, a gun or car hashtag ISIS."

A search of the youth's computer resulted in the discovery of terrorist images and propaganda.

Court heard the youth had also been in contact with a fighter from ISIS and that he had searched for the ISIS flag, ISIS video and ISIS messages on the computer.

Court heard further investigation revealed the youth did not have a passport, but was looking for guidance on how to move overseas.

It was also described how the youth allegedly became "a person of interest" and was interviewed by investigators from the National Security Enforcement Section in July 2015 the presence of his father.

Initially, the youth denied the Twitter account belonged to him, but later acknowledged to investigators it was his.

"He indicated he was planning to leave Canada to fight for the Islamic State," Mahon told court. "He indicated if he was unable to travel, he would strike from within."

"He was going to target government buildings, monuments, infrastructure such as electrical grids and federal employees."

Mahon told court the youth indicated he conducted research to do this, and drawings and notebooks were seized by investigators.

Mahon told court he listened to the interview with the youth several times.

"This is all said in a very matter-of-fact tone. Police describe it as a chilling interview."

The teen was arrested on Nov.3, 2015.

The prosecution and defence are seeking a 14 month sentence, followed by intensive rehabilitation custody. Following release from custody, Mahon told court the sentence would involve seven months of supervised custody and a list of 24 conditions including no access to computers or social media and not having contact with any terrorist groups or organizations.

Two years of tracking and counselling would follow the supervised custody order.

The prosecution wants the youth to wear a GPS monitoring device after the seven months is up, but defence lawyer Saul Simmonds disagrees. He thinks his client should wear the GPS device for seven months after he gets out of custody.

"It's been brought home to him and his family just how serious this offence is," Simmonds told court. "It does hold him accountable."

When asked in court by the judge if he had anything to say the teen said, "I regret what I've done."

"I was struggling with my identity. I'd like to apologize to my family for the stress that I've caused them, also to the Crown and police for using their resources and also for causing a stir in the community."

The teen was 16 years old at the time of the offence and cannot be named due to provisions in the Youth Criminal Justice Act.

Sentencing for the case was adjourned until Jan. 9.