We'll talk about the downing likely of the Malaysia flight seventeen at 777 jet en route from Amsterdam to one a month -- brought down over eastern Ukraine. Apparently shot down by a missile 295 people on board. Seen no sign of life mr. Obama now speaking in willing. My Delaware seat it's obviously. It is wonderful to be back in Delaware. Before again. Obviously the world is watching reports. On the bound passenger jet did Russia and Ukraine border. And it looks like it may be a terrible tragedy. Right now we're working determine. Whether there were American citizens on board. That is our first priority and I've directed my national security team to stay in close contact. With the Ukrainian government. The United States won't offer any assistance we can't help determine what happened and -- And as a country are. Thoughts and prayers are with hall of -- passengers wherever they call. I want to thank Jeremy forward. That introduction. President Obama in Wilmington Delaware. The Interfax news agency reported that 23 Americans were on that Malaysia air flight seventeen though the US State Department has. No information to confirm that. We go to -- CBS news White House correspondent Peter Mayer and I'm mr. Obama has been on the phone with that with his counterpart in Russia. Well that's right it was a previously planned call Putin had requested -- Dave to discuss the tensions. Between the US and Moscow over the situation in Ukraine. And we're told that at the very end of that conversation. Who -- gave the president what the Russians are describing as the initial word of this plane crash. Now you conceived by the tone of the president's remarks and the brevity there that caution is the byword the US has not independently verified. Any of the details. Of this crash and that certainly has not confirmed the various reports from the scene. That this aircraft was shot down CBS is Peter mayor. 280 passengers fifteen crew members were bored Malaysia flight seventeen no one believed -- survived a New York Times reporter on the scene and eastern Ukraine says many of the bodies were still in their seat belts and we're still attached. Two pieces of the plane so terrible tragedy in Ukraine. More details as they become available this has been CBS news special report for Peter -- I'm Dave Barrett CBS news.