Military Base Shooting(01 of17)
Open Image ModalThe glass window of the Armed Forces Career Center is riddled with bullet holes after a gunman opened fire on the building Thursday, July 16, 2015, in Chattanooga, Tenn. Authorities say there were multiple casualties including the gunman. (AP Photo/John Bazemore) (credit:ASSOCIATED PRESS)
APTOPIX Chattanooga Shooting(02 of17)
Open Image ModalPolice 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, Tenn. Authorities say there were multiple casualties including the gunman. (AP Photo/John Bazemore) (credit:ASSOCIATED PRESS)
Chattanooga Shooting(03 of17)
Open Image ModalIn this image made from video and released by WRCB-TV, a person lies on the grass near a makeshift memorial at the scene of a shooting in Chattanooga, Tenn., Thursday, July 16, 2015. A gunman unleashed a barrage of gunfire at two military facilities a few miles apart killing several Marines, officials said. The gunman was also killed. (Josh Rhoden/WRCB-TV via AP) MANDATORY CREDIT (credit:ASSOCIATED PRESS)
Chattanooga Shooting(04 of17)
Open Image ModalThis April 2015 booking photo released by the Hamilton County Sheriffs Office shows a man identified as Mohammad Youssduf Adbulazeer after being detained for a driving offense. A U.S. official speaking on condition of anonymity identified the gunman in shootings at two Chattanooga military facilities as Muhammad Youssef Abdulazeez, who shares the same age and address as the man in the photo. (Hamilton County Sheriffs Office via AP) (credit:ASSOCIATED PRESS)
Chattanooga Shooting(05 of17)
Open Image ModalIn this frame from video, law enforcement officers detain a woman as they surround a house in Hixson, Tenn., Thursday, July 16, 2015. A gunman unleashed a barrage of fire at two sites a few miles apart in Chattanooga, killing several, officials said. The attacker was also killed. (AP Photo/Alex Sanz) (credit:ASSOCIATED PRESS)
Four Marines Killed In Military Center Shootings In Chattanooga, Tennessee(06 of17)
Open Image ModalCHATTANOOGA, TN - JULY 16: Police and State Troopers block entrances to the TN Naval Reserve Center July 16, 2015 in Chattanooga, Tennessee. According to published reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images) (credit:Jason Davis via Getty Images)
Security Increased At New York City Area Military Recruiting Centers(07 of17)
Open Image ModalNEW YORK, NY - JULY 16: New York City police officers stand guard at a military recruiting center in Times Square July 16, 2015 in New York City. The added security comes after a gunman this morning in Chattanooga, Tennessee first sprayed with bullets a military recruiting station at a strip mall, before moving to another location more than seven miles away where he shot and killed four U.S. Marines at an operational support center operated by the U.S. Navy, according to published reports. The gunman was also killed. (Photo by Andrew Burton/Getty Images) (credit:Andrew Burton via Getty Images)
Four Marines Killed In Military Center Shootings In Chattanooga, Tennessee(08 of17)
Open Image ModalCHATTANOOGA, TN - JULY 16: A general view of a crime scene after Four Marines were killed in Military Center Shootings on July 16, 2015 in Chattanooga, Tennessee. According to published reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images) (credit:Jason Davis via Getty Images)
Four Marines Killed In Military Center Shootings In Chattanooga, Tennessee(09 of17)
Open Image ModalCHATTANOOGA, TN - JULY 16: A general view of a crime scene after Four Marines were killed in Military Center Shootings on July 16, 2015 in Chattanooga, Tennessee. According to published reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images) (credit:Jason Davis via Getty Images)
Four Marines Killed In Military Center Shootings In Chattanooga, Tennessee(10 of17)
Open Image ModalCHATTANOOGA, TN - JULY 16: A general view of a crime scene after Four Marines were killed in Military Center Shootings on July 16, 2015 in Chattanooga, Tennessee. According to published reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images) (credit:Jason Davis via Getty Images)
Four Marines Killed In Military Center Shootings In Chattanooga, Tennessee(11 of17)
Open Image ModalCHATTANOOGA, TN - JULY 16: Police and State Troopers block entrances to the TN Naval Reserve Center July 16, 2015 in Chattanooga, Tennessee. According to published reports, Mohammod Youssuf Abdulazeez, 24, opened fire on a military recruiting station at a strip mall and then killed four U.S. Marines at an operational support center operated by the U.S. Navy at another location more than seven miles away, where the gunmen himself was also killed. (Photo by Jason Davis/Getty Images) (credit:Jason Davis via Getty Images)
Chattanooga Shooting(12 of17)
Open Image ModalIn this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) MANDATORY CREDIT (credit:ASSOCIATED PRESS)
Chattanooga Shooting(13 of17)
Open Image ModalIn this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) MANDATORY CREDIT (credit:ASSOCIATED PRESS)
Military Base Shooting(14 of17)
Open Image ModalA 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. (AP Photo/John Bazemore) (credit:ASSOCIATED PRESS)
Chattanooga-Shooting(15 of17)
Open Image ModalPlastic cups mark evidence outside the Armed Forces Career Center after a gunman open fire on the building Thursday, July 16, 2015, in Chattanooga, Tenn. Authorities say there were multiple casualties including the gunman. (AP Photo/John Bazemore) (credit:ASSOCIATED PRESS)
Chattanooga Shooting(16 of17)
Open Image ModalIn this frame from video, law enforcement officers surround a house in Hixson, Tenn., Thursday, July 16, 2015. A gunman unleashed a barrage of fire at two sites a few miles apart in Chattanooga, killing several, officials said. The attacker was also killed. (AP Photo/Alex Sanz) (credit:ASSOCIATED PRESS)
APTOPIX Chattanooga Shooting(17 of17)
Open Image ModalIn this image made from video and released by WRCB-TV, authorities work an active shooting scene on amincola highway near the Naval Reserve Center, in Chattanooga, Tenn. on Thursday, July 16, 2015. Chattanooga Mayor Andy Berke says police are pursuing an active shooter after reports of a shooting at the military reserve center. (WRCB-TV via AP) MANDATORY CREDIT (credit:ASSOCIATED PRESS)