How phone calls, sessions at gun ranges and secret meetings in parks led the FBI to charge suspects in alleged terrorist plot

A series of encrypted phone calls – secretly recorded by a confidential FBI source – tipped federal agents that a group was allegedly planning to carry out a terrorist attack in Michigan on behalf of ISIS, according to a criminal complaint unsealed Monday.

​ A series of encrypted phone calls – secretly recorded by a confidential FBI source – tipped federal agents that a group was allegedly planning to carry out a terrorist attack in Michigan on behalf of ISIS, according to a criminal complaint unsealed Monday. Read More Breaking News, Latest News and Videos | CNN