I heard Guatemala found a bunch of ISIS infiltrates in the group.
Your article doesn't seem very supportive of the claim:
Bensman suggested a “healthy skepticism” of Morales’ claims is warranted, as the Guatemalan president has been dogged by accusations of corruption and is currently seeking $15 billion in security assistance from the U.S.
Bensman also quoted a Guatemalan reporter who told him in an email:
All of the journalists down here believe that this is bulls**t, and Morales is just trying to look good to Pence, Trump, and the U.S., but there hasn’t been any reporting or news regarding this issue in Guatemala. Since most of us cover the interior ministry and the police, and they always make a big show whenever they capture someone, we think it’s bulls**t.