Dahir Adan has been named as a suspect in the stabbing attack at a St. Cloud, Minnesota, mall on Saturday night

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Dahir A. Adan has been named a suspect in the Saturday night stabbing attack at a mall in St. Cloud, Minnesota, not far from where he’d worked briefly as a security guard, PEOPLE confirms.

And while ISIS has claimed credit for the attack, authorities believe at this time that Adnan, 22, acted alone, a federal counterterrorism official tells PEOPLE.

The official alleges Adan yelled “Allahu Akbar” – “God is [the] greatest” – and asked the victims if they were Muslim before attacking them.

Authorities are also reviewing Adan’s possible overseas connections or ties to radicalism, if any, the counterterrorism official says.

The official says said the Adan, who was killed by police, was wearing a private security uniform and was armed with a five-inch kitchen knife during the attack, about 8:15 p.m. Saturday.

A spokeswoman for appliance company Electrolux North America confirms to PEOPLE he was at one time a temporary guard at one of its stores via a third-party firm.

“Mr. Adan was an employee of Securitas, a security provider. He was not an Electrolux employee,” Electrolux spokeswoman Eloise Hale tells PEOPLE. “For a few months, he was assigned as a temporary weekend security guard, which ended last June, at Electrolux Home Products in St. Cloud.”

One Electrolux security guard in St. Cloud declined to comment to PEOPLE about what kind of person Adan had been but said, “This is bad.”

In a news conference Monday, President Barack Obama said there was no connection between the stabbing and the explosions in New York City and New Jersey this weekend.

However, Obama did say the Minnesota attack was being investigated as an act of terrorism..

The federal counterterrorism official says Adan was “not previously known to us.” The official says that authorities have interviewed 50 people in the investigation and are searching Adan’s computer, iPhone and other belongings, as well as reviewing his social media activity.

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College Dropout

Adan had recently stopped attending college, where he would have been a sophomore, St. Cloud University spokesman Adam Hammer tells PEOPLE.

“He was not currently enrolled at St. Cloud. Spring 2016 was his last semester. He started in 2014,” Hammer says.

He continued, “[Adan] named an intended major in Information Systems but was not accepted in that major. That would be standard for any school. He did not have enough credits to declare a major.

“I have no information on what type of student he was and whether he withdrew, stopped coming or left for any other reason. All I have is that he previously was enrolled but was not a current student.”

Adan was born in Kenya on April 10, 1996, and came to the United States as a 2-month-old infant that June, according to the federal law enforcement official.

His application for U.S. citizenship was approved in 2008, the law enforcement official tells PEOPLE.

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Timeline of the Attack

Authorities say Adan was shot by an off-duty police officer, Jason Falconer, after Adan allegedly injured eight men and two women ranging in age from 15 to 53 inside the Macy’s department store at Crossroads Center mall.

St. Cloud Police Chief William Anderson said in an earlier news conference that all of the victims were expected to survive. Three remained in the hospital as of Sunday morning, he said.

Police executed search warrants for two apartments, including the one where Adan lived with his father, Anderson said.

They also impounded the assailant’s car from the mall parking lot, he said.

Authorities said video footage of the incident is being pieced together.

With reporting by SUSAN KEATING