By Steve Neavling
The mystery about what motivated Muhammad Abdulazeez to target military targets has drawn dozens of additional FBI agents to Chattanooga, Tenn., this week, ABC reports.
Investigators still have not found any connection to ISIS and are now looking at Walmart where the 24-year-old may have joined two other men as he purchased ammunition.
His family has indicated he was showing an elevated interested in powerful weapons.
But his family also said he was often suicidal after losing his job in 2013.