( CNN ) A group of six young Minnesota men conspired to sneak into Syria and join ISIS `` by any means necessary , '' federal prosecutors said Monday . The group of friends , ages 19 to 21 , were arrested Sunday . `` What 's remarkable about this case was that nothing stopped these defendants from plotting their goal , '' said U.S. Attorney Andrew M. Luger of the District of Minnesota . `` They were not confused young men . They were not easily influenced . These are focused men who are intent on joining a terrorist organization by any means possible . '' Recruiting for the ISIS terrorist network is a particular problem in Minnesota 's community of Somali immigrants . `` People often ask who is doing the recruiting and when will we catch the person responsible , '' Luger said . `` But it is not that simple . In today 's case , the answer is that this group of friends is recruiting each other . They 're engaged in what we describe as peer-to-peer recruiting . '' Zacharia Yusuf Abdurahman , 19 ; Adnan Farah , 19 ; Hanad Mustafe Musse , 19 ; and Guled Ali Omar , 20 , were arrested in Minneapolis . Abdirahman Yasin Daud , 21 , and Mohamed Abdihamid Farah , 21 , were arrested in San Diego after driving there in hopes of crossing into Mexico , Luger said . They plotted for 10 months , Luger said . `` Even when their co-conspirators were caught and charged , they continued to seek new and creative ways to leave Minnesota to fight for a terror group . '' Another friend , who was part of the group , changed his mind and became a cooperating witness for the FBI , even tape recording some meetings , Luger said . The FBI investigation has previously netted Abdullahi Yusuf , who has pleaded guilty to conspiring to provide material support to ISIS , and Hamza Ahmed , who has been indicted on charges of conspiring and attempting to provide material support to ISIS and is now pending trial , according to the criminal complaint . The complaint describes a man , identified only as `` Nur , '' who has spent time in Syria and allegedly helped the six accused men . Four of the men who were arrested appeared in federal court on Monday but did not enter a plea . The judge ordered they all be held without bail , and a detention hearing was scheduled for Wednesday . CNN 's Tony Marco contributed to this report .
Six young Minnesotans conspired to sneak into Syria and join ISIS `` by any means necessary , '' prosecutors say . The men , ages 19 to 21 , were arrested 10 months . They plotted for Sunday , the U.S. attorney for the District of Minnesota says .