Isaiah Mordal, 22, and his girlfriend Johanna Bohnenkamp, 15, who is 9 months pregnant, outside their home in Big Lake on Monday, Sept. 19, 2016. Mordal and Bohnenkamp were both attacked by a man, suspected of being motivated by global terror, who stabbed several people late Saturday, Sept. 17 before an off-duty police officer fatally shot the attacker at the Crossroads Center mall in St. Cloud, Minn. (Leila Navidi/Star Tribune via AP)

ST. CLOUD, Minn. - The Latest on the stabbings at a Minnesota mall over the weekend (all times local):

4 p.m.

Somalis in a central Minnesota city are trying to square the bright, family-minded young man who went to the mall to buy the new iPhone with the emotionless man who stabbed 10 people and in death is the subject of a terrorism investigation.

The aftermath of Saturday's attack at Crossroads Center Mall in St. Cloud also is testing longstanding efforts to improve strained relations between the city's Somali community and other residents.

Several Somalis said they saw pickups driving through predominantly Somali neighbourhoods the night after the attack, waving confederate flags and honking.

It's still unclear what led 20-year-old Dahir Adan to stab several people with what appeared to be a kitchen knife before he was confronted and killed by an off-duty police officer.

The FBI said Tuesday that its Joint Terrorism Task Force will take over the investigation.

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3:50 p.m.

The FBI says the investigation into a knife attack at a Minnesota mall is now a federal probe.

FBI Special Agent in Charge Rick Thornton and St. Cloud Police Chief Blair Anderson announced Tuesday that the case will now be led by the FBI's Joint Terrorism Task Force. The St. Cloud Police Department will continue to assist.

Authorities say 20-year-old Dahir Ahmed Adan stabbed 10 people at Crossroads Center mall on Saturday before he was shot and killed by an off-duty police officer.

Thornton said earlier this week that authorities are investigating the attack as a potential act of terrorism.

FBI spokesman Kyle Loven said authorities are following up on all leads, and figuring out what motivated Adan is a big part of the investigation.

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3:35 p.m.

The chairman of the U.S. Senate's Homeland Security and Governmental Affairs Committee is seeking more information on two men accused in potential acts of terror.

Wisconsin Sen. Ron Johnson is asking the Department of Homeland Security to provide information about Dahir Ahmed Adan, who was killed after he stabbed or cut 10 people at a Minnesota mall, and Ahmad Khan Rahami, who is accused of leaving bombs in New York and New Jersey.

Johnson says it's important for Congress to learn more about these men in order to evaluate efforts to counter homegrown extremism. Among other things, Johnson is seeking the men's immigration records, records on foreign travel and any citizenship applications.

Authorities have said they're looking at the Adan attack as possible terrorism, in part because an Islamic State-run news agency claimed he was a "soldier of the Islamic State." It is unclear whether Adan was radicalized.

The Republican is in a close race for re-election with Democrat Russ Feingold.

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12 p.m.

A man who was stabbed in the back during a knife attack at a St. Cloud mall that injured nine others says he begged his attacker not to kill him.

Isaiah Mordal says he was leaving work at a pretzel shop at Crossroads Center mall Saturday with his girlfriend Johanna Bohnenkamp when he saw Dahir Adan stab two others.

Mordal tells KARE-TV (http://kare11.tv/2deRVXu ) he and Bohnenkamp were cornered by the man before they could run. Mordal suffered a stab wound that required stitches.

When confronted, Mordal said he told Adan, "please don't do this."

The man then turned to Bohnenkamp, who is nine months pregnant. As Mordal screamed and ran at him, the man cut the back of Bohnenkamp's neck.

An off-duty officer fatally shot Adan. All ten victims survived their wounds.

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1:40 a.m.

He was a recent college student and had worked part time. He was said to be a high school honours student. He had nothing more than a minor traffic citation on his record.

But on Saturday, for reasons still unclear, authorities say Dahir Ahmed Adan went to a central Minnesota mall and cut or stabbed 10 people before he was shot and killed by an off-duty police officer.

Little new information was released Monday about the 20-year-old Adan. But authorities are investigating the attacks as a potential act of terrorism.

A Somali community advocate who spoke with Adan's parents said he was going to the mall to pick up an iPhone.

Those who know Adan say he was a calm, cool guy, and they are trying to figure out what pushed him to violence.

News from © The Associated Press, 2016