The 18-year-old had been under investigation for nearly two years, trading messages with a confidential informant, before agents sold him the rifle and ammunition and arrested him on the spot, they said.
FBI agents thwarted a terror attack by a teenager on the Mall of America after monitoring him for nearly two years and ultimately supplying him with the AK-47 he planned to use, authorities said Wednesday.
The 18-year-old had been on the FBI’s radar since December 2024, when he began trading messages with a confidential informant. A criminal complaint says he initially expressed an interest in traveling to Somalia to fight for al-Shabab militants. As his plans to instead attack the mall solidified, the complaint says, agents sold him the gun and ammunition on Tuesday and arrested him on the spot.
“This was a radicalized young man who needed to be watched,” US Attorney Daniel Rosen said. Agents “were 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.”
Sheikhdoon Abdullahi Mohamud was arrested Tuesday in a public park in Richfield, several miles northwest of the Mall of America, after he paid $600 to an undercover FBI employee posing as a member of the Islamic State group for the rifle and 200 rounds of ammunition, the agency said.
Mohamud appeared in a yellow jail uniform for his initial appearance Wednesday in federal court in St Paul. He told the judge he did not have a job, own a house or a car, or have any money in the bank. He was represented by Siri Carlson McDowell, a federal public defender. Carlson McDowell and relatives of Mohamud declined to comment after the hearing.
Rosen said Mohamud is an American-born US citizen of Somali descent.
According to an FBI agent’s sworn complaint, Mohamud repeatedly affirmed in chat messages to the informant that he intended to attack and kill non-Muslims at the mall on October 24, the date of a scheduled arts celebration by the Hmong community, Minnesota’s largest Asian ethnic group.
When the informant asked if he was serious about committing the attack, Mohamud replied, “yes i am 100% sure,” the complaint said, and added: “I would have backed out by now if I wasn’t sure.”
The agent wrote that Mohamud’s messages expressed admiration for recent terror attacks as well as an interest in traveling to fight in Somalia, ultimately for the Islamic State group. He later decided he couldn’t afford to travel there and would attack the mall instead, the complaint said.