Gunman's attack kills 4 marines

A gunman opened fire at a recruiting center and another US military site in Chattanooga, Tennessee, on Thursday, killing at least four marines before he was shot dead by police.

Federal authorities said they were investigating the possibility that the double attack was an act of terrorism, but they added they had no evidence that any one other than a lone gunman was involved.

Authorities identified the killer as Kuwait-born Muhammad Youssef Abdulazeez, 24, of Hixson, Tennessee.