CRI听力:4 US Marines Killed in Military Attacks in Tennessee

Five people, including the lone gunman and four US Marines, have been killed in shootings at two military facilities in the US state of Tennessee.

Local police say the incidents at a Naval Reserve Center and a nearby military recruiting center in the city of Chattanooga lasted about 30 minutes combined, starting at around 11 o'clock in the morning local time on Thursday.

Chattanooga Mayor Andy Berke says it's a nightmare for the city.

"We do know that we have four individuals who were killed, who are victims. We know that the shooter was killed at the scene as well. Also, one Chattanooga police officer was shot in the ankle and is being treated very well at Erlanger, as well as there were some other individuals who were shot and have also been treated."

The local district lawyer says the shootings are being investigated as an "act of domestic terrorism" but other officials have expressed caution at jumping to conclusions.

President Barack Obama calls the Marines' killing "heartbreaking".

"At this point, a full investigation is taking place. The FBI will be in the lead working closely with local law enforcement. We've also been in contact with the Department of Defense to make sure that all our defense facilities are properly attentive and vigilant as we sort through exactly what happened."

US media say the gunman has been identified as 24-year-old Muhammad Youssef Abdulazeez, who is believed to have been born in Kuwait.

He was shot dead after a gunfight at the Navy Reserve Center.

His motive remains unclear.