025 at his home but were told he wasn't home. At the time, Mohamud had recently turned 17 and agents were told he was still at school.

According to the complaint, Mohamud's father told agents that they did not want to speak, and they would have to talk with an attorney. However, U.S. Attorney Daniel Rosen said authorities didn't suspect Mohamud's parents understood the extent of his radicalization.

Mohamud wasn't arrested until just this past Tuesday. U.S. Attorney Daniel Rosen says the arrest occurred after they believed Mohamud became an immediate threat after he purchased the assault weapon and ammo.

Authorities react to arrest

What they're saying:

At a news conference on Wednesday, the U.S. Attorney's Office and FBI officials discussed Mohamud's arrest.

 The FBI yesterday arrested, and today we have charged, an individual who was planning a mass casualty attack in support of ISIS at the Mall of America later this month,  said Rosen.  [Federal law enforcement was] able to detect a threat and disrupt it before the defendant carried out his intention to kill, in his words, maybe 30 to 60 people, as we allege in far greater detail in the complaint. 

FBI officials described Mohamud's messages as  chilling. 

 The messages this defendant allegedly sent to others were chilling,  said FBI Minneapolis Special-Agent-in-Charge Christopher Dotson.  They document the idealization of ideologically-motivated violence, a callous disregard for the sanctity of human life, a blind hatred of people of other faiths, and a cold commitment to carrying out his vision of violence in our community. 

Dotson praised his agents' ability to thwart the attack.  Instead of finding the means to kill countless innocent Americans, this defendant found a team of FBI agents there to arrest him and ensure he is held accountable in federal court.