By Richard Valdmanis
CHATTANOOGA, Tenn. (Reuters) - A male U.S. Navy petty officer has died of wounds sustained in this week's shooting in Chattanooga, Tennessee, the U.S. Navy said on Saturday, raising the number of people killed in the attack to five.
The suspected shooter, Mohammod Youssuf Abdulazeez, a Kuwaiti-born naturalized U.S. citizen, also died on Thursday in a firefight with police after the rampage at two military facilities.
The Navy's brief statement did not identify the petty officer who died or provide his age or hometown. Four U.S. Marines were also killed in the attack and two other people, a Marine and a police officer, were wounded.
A little more than 24 hours after the shooting, the FBI said it continued to investigate it as an act of terrorism and that it was "premature" to speculate on the motive.
"We are exploring all travel that he has done and we have asked our intelligence partners throughout the world to provide us with any information they may have," Ed Reinhold, FBI special agent in charge, said during a news conference.
The suspect traveled to Jordan and possibly other Middle Eastern countries for seven months last year, according to authorities, who are looking for any signs of a connection to Islamist militants.
Investigators will try to establish if he was part of an organization or the latest "lone wolf" militant, radicalized U.S. Muslims acting on their own who President Barack Obama has said pose a greater risk to the country than a large-scale operation.
(Reporting By Frank McGurty in New York and Mark Hosenball in Washington; Writing By Frank McGurty; Editing by Tom Heneghan)