FBI Investigating Suspect's Possible Link to Islamic State in Chattanooga Shooting

The FBI announced over the weekend they are continuing to investigate the suspect behind the recent Chattanooga Marines shooting for any possible connection to the Islamic State.

The chairman of the House Committee on Homeland Security said over the weekend that the FBI is currently combing 24-year-old suspect Mohammad Youssef Abdulazeez's social media accounts and cellphone to find if he had any history or connection with the Islamic State.

The government agency is also researching whether the naturalized U.S. citizen's recent trip to Jordan may be a connection to the foreign terrorist group.

The FBI revealed recently that just hours before the July 16 shooting that killed five marines in Chattanooga, Tennessee, Abdulazeez sent a text quoting an Islamic verse that read: "Whoever shows enmity to a friend of Mine, then I have declared war against him."

A representative for the shooter's family also told ABC News that the 24-year-old reportedly suffered from depression caused by drug use, including opioids and painkillers, and had written in a diary that he wanted to become a "martyr" after losing his job due to his drug use.

The suspect's family released a statement over the weekend saying there "no words to describe our shock, horror, and grief."

"The person who committed this horrible crime was not the son we knew and loved," the statement said. "For many years, our son suffered from depression. It grieves us beyond belief to know that his pain found its expression in this heinous act of violence."