Body of Lane Graves was found "completely intact" with only a few puncture wounds.
Mateen was investigated twice for possible extremist views in 2013 and 2014, according to FBI.
Police probing evidence suggesting the attack may have been inspired by Islamic State militants.
Now Vietnam can buy American military equipment, train with US forces and challenge Chinese claims in the South China Sea.
When will we get tough, smart and vigilant, Trump asks on Twitter.
Presumptive Republican nominee calls for renegotiation of the Paris climate accord.
The installation of surveillance systems will give China long-term "civil-military bases" in the disputed waters.
On the Democratic side, Senator Bernie Sanders scored an upset victory over front-runner Hillary Clinton
The nuclear- powered Stennis has been patrolling in the South China Sea, which is claimed by China in full.
Target list with message saying "We want them #Dead" posted on encrypted messaging app Telegram.
Forced confessions of foreign prisoners -- as well as the broadcasting of the confessions -- are routine in North Korea.
Yonhap reported earlier North Korea was preparing to launch Musudan intermediate-range ballistic missile.
The Workers Party conference is the first since ruler Kim Jong-un was born.
Harry Reid, Senate Democratic leader, says Bernie Sanders has no realistic path to winning the nomination.
Analysts say the nuclear power platform will play a key role in advancing China's long-term South China Sea strategy.