US President Barack Obama has voiced deep regret over two shootings in the state of Tennessee that left at least four members of the United States Marine Corps dead.
"We don't know yet all the details, we know that what appears to be a lone gunman carried out these attacks. We have identified a name," Obama said on Thursday after he was briefed by FBI Director James Comey.
"It is a heartbreaking circumstance for these individuals who have served our country with great valor to be killed in this fashion," Obama told reporters in the Oval Office.
Shootings at two military offices in Chattanooga, Tennessee, on Thursday left five people dead, including four Marines and the lone gunman, according to officials.
Investigators were seeking to determine on Thursday night what led 24-year-old Mohammod Youssuf Abdulazeez, identified as the shooter by the Federal Bureau of Investigation, to open fire at the Marines.
The shooter, a naturalized US citizen who was born in Kuwait, is also dead, according to local police.

"Although the families are still in the process of being contacted, I want them to know that I speak for the American people in expressing our deepest condolences and knowing that they have our full support in trying to overcome the grief that's involved here," Obama said.
"We take all shootings seriously," Obama said, acknowledging the additional concern of the attack occurring at a military facility.
The white shooter driving a car first opened fire at an Armed Forces Career Center at a strip mall and then sped off in the car toward the US Naval Reserve Center on Amnicola highway, where he fatally shot at the offices, killing the four Marines.
“While it would be premature to speculate on the motives of the shooter at this time, we will conduct a thorough investigation of this tragedy and provide updates as they are available,” the FBI said in a statement.
Tennessee Governor Bill Haslam said that "lives have been lost from some faithful people who are serving our country."