A terrorism investigation is going on in Minnesota and San Diego. Authorities concerned have been looking for youngsters who have traveled or tried to travel to Syria to fight with militants and the Islamic State group.

In connection to that investigation, six people have been arrested. A spokesman for the Minnesota US Attorney's Office sharing the information about the arrests said that the arrests were made on Sunday in Minneapolis and San Diego.

Spokesman Ben Petok said the information with regard to the charges would be publicized on Monday. The US Attorney's Office and the FBI have planned a news conference on Monday and there, details will be released.

It has been found that some of the Minnesota residents have travelled to Syria to fight with militants last year. In fact, one of them has even died while fighting for the Islamic State. Since 2007, more than 22 young Somali men have travelled from Minnesota to Somalia to join the militant group al-Shabab.

Four Minnesotans are already facing charges with regard to connection with terror groups in Syria. One of them was a 19-year-old Hamza Ahmed, who stopped at a New York City airport in November. He along with three others was attempting to travel to Syria.

Ahmed is facing charges for lying to the FBI during a terrorism investigation and attempting to provide material support. He has pleaded not guilty. For now, no changes have been levied against three companions and there is little information released about them. As per an FBI affidavit, all of them are aged between 19 and 20.