Investigators on Friday sought to determine what led a 24-year-old gunman to open fire at two military offices in Chattanooga, Tennessee, killing four Marines in an attack officials said could be an act of domestic terrorism. Mohammod Youssuf Abdulazeez, identified as the shooter by the Federal Bureau of Investigation, was shot to death in the rampage that also injured three people, including a sailor who was critically wounded. The attack comes at a time when U.S. military and law enforcement authorities are increasingly concerned about the threat "lone wolves" pose to domestic targets. The suspect, seen driving an open-top Ford Mustang, first went to a joint military recruiting center in a strip mall and sprayed it with gunfire, riddling the glass facade with bullet holes. "Everybody was at a standstill and as soon as he pulled away everyone scrambled, trying to make sure everyone was OK," said Erica Wright, who works two doors down from the center. The gunman then drove off to a Naval Reserve Center about 6 miles (10 km) away, fatally shooting the four Marines before being shot and killed in a firefight with police. Three others were wounded in the attacks, including a police officer reported to be in stable condition and a Marine. The shootings began around 10:45 a.m. (1445 GMT) and ended about 30 minutes later. NBC News reported that Abdulazeez was a naturalized American who was born in Kuwait. U.S. law enforcement officials said they were investigating whether he was inspired by Islamic State or a similar group. Islamic State had threatened to step up violence in the holy fasting month of Ramadan, which ends on Friday evening. The extremist group, also known as ISIS and ISIL, claimed responsibility when a gunman in Tunisia opened fire at a popular tourist hotel and killed 37 people in June. On the same day, there was an attack in France and a suicide bombing in Kuwait. At a news conference late Thursday, Edward Reinhold, special agent in charge of the FBI's Knoxville, Tennessee, division, said investigators had found nothing that tied the suspect to an international terrorist organization. Nobody else had been taken into custody, he said. The SITE Intelligence Group, which tracks extremist groups, said that Abdulazeez blogged on Monday that "life is short and bitter" and Muslims should not miss an opportunity to "submit to Allah." Reuters could not independently verify the blog postings. The New York Times, citing unnamed law enforcement officials, reported that his father had been under investigation several years ago, over possible ties to a foreign terrorist organization. His name was later removed from a terror watch list. According to a resume believed to have been posted online by Abdulazeez, he attended high school in a Chattanooga suburb and graduated from the University of Tennessee with an engineering degree. "I remember him being very creative. He was a very light-minded kind of individual. All his videos were always very unique and entertaining," said Greg Raymond, 28, who worked with Abdulazeez on a high school television program. "He was a really calm, smart and cool person who joked around. Like me, he wasn't very popular so we always kind of got along. He seemed like a really normal guy," Raymond said.
