Video Shows Chattanooga Gunman's DUI Arrest

— -- Newly released video shows the Chattanooga gunman being arrested for driving under the influence earlier this year, an incident his family believes may have led to him opening fire at two military offices in Chattanooga, Tennessee, killing five service members.

The video shows Mohammod Abdulazeez being stopped after 2 a.m. on April 20 by police for "driving over 10 mph under the speed limit, and stopping at green lights." During the stop, an officer says he noticed that Abdulazeez car smelled like alcohol and marijuana odor, and that his eyes were bloodshot and that he was unsteady with slurred speech, according to the arrest report.

The video also shows Abdulazeez taking a field sobriety test. After walking the line, an officer notes that Abdulazeez "is counting steps that aren't happening."

An officer said he also noticed irritated nostrils and a white powdery substance under his nose, but Abdulazeez responded that he had "crushed caffeine pills and snorted them" and that he was around friends who were drinking and smoking marijuana.

Abdulazeez, 24, was charged with driving under the influence. He refused to consent to the state blood test, police said.

Earlier this month, Abdulazeez opened fire at the Navy Operational Support Center and the Marine Reserve Center in Chattanooga before he was killed by a police officer.

The FBI is considering Abdulazeez a "homegrown, violent, and extremist" who acted on his own, though the agency is investigating all possible leads and every relative and associate he has, including an uncle in Jordan, FBI Special Agent Edward Reinhold said last week.