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USMC Captain Ty Balzer, left, speaks to media as Chattanooga Police Chief Fred Fletcher listens from behind during a press conference at Tennessee Valley Authority's Missionary Ridge Auditorium on Friday, July 17, 2015 the day after a four Marines were shot and killed. The investigation is being treated as an act of terrorism. Photo by Dan Henry /Times Free Press.

Sophia Ensley, right, and Barbie Branum hug in front of an Amnicola Highway memorial for victims of the July, 16 shootings on Saturday, July 18, 2015, in Chattanooga, Tenn. U.S. Navy Petty Officer Randall Smith died Saturday from wounds sustained when gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press

An FBI investigator investigates the scene of a shooting outside a military recruiting center on Friday, July 17, 2015, in Chattanooga, Tenn. Mohammad Youssef Abdulazeez of Hixson, Tenn., attacked two military facilities on Thursday, in a shooting rampage that killed four Marines. (AP Photo/John Bazemore) Photo by Associated Press /Times Free Press.

Chattanooga Deputy Police Chief David Roddy, right, hugs Sgt. Denny Jones before an interfaith vigil at Olivet Baptist Church held in remembrance of victims of the July, 16 shootings on Friday, July 17, 2015, in Chattanooga, Tenn. The vigil was held one day after gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press

Four crosses are staked in the ground at a Lee Highway memorial in front of the Armed Forces Career Center for the first four victims of the July, 16 shootings on Saturday, July 18, 2015, in Chattanooga, Tenn. U.S. Navy Petty Officer Randall Smith died Saturday from wounds sustained when gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press

Angelica Delgadillo looks at a Lee Highway memorial for victims of the July, 16 shootings on Saturday, July 18, 2015, in Chattanooga, Tenn. U.S. Navy Petty Officer Randall Smith died Saturday from wounds sustained when gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press

The American flag flies at half mast in Coolidge Park after Tennessee Gov. Bill Haslam ordered it lowered in honor of victims of the July, 16 shootings on Saturday, July 18, 2015, in Chattanooga, Tenn. U.S. Navy Petty Officer Randall Smith died Saturday from wounds sustained when gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press

A police officer investigates outside the Armed Forces Career Center after a gunman opened fire on the building Thursday, July 16, 2015, in Chattanooga, Tenn. Authorities say there were multiple casualties including the gunman. Photo by Associated Press /Times Free Press.

Police officers enter the Armed Forces Career Center through a bullet-riddled door after a gunman opened fire on the building Thursday, July 16, 2015, in Chattanooga. Authorities say there were multiple casualties including the gunman. Photo by Associated Press /Times Free Press.

Yusra Siddiqui, right, and Zoha Ahmad, who came with others from the Islamic Society of Greater Chattanooga to offer their support, pray during an interfaith vigil at Olivet Baptist Church held in remembrance of victims of the July, 16 shootings on Friday, July 17, 2015, in Chattanooga, Tenn. The vigil was held one day after gunman Mohammad Youssef Abdulazeez shot and killed four U.S. Marines and wounded two others and a Chattanooga police officer. Photo by Doug Strickland /Times Free Press