ABC's world news and asked. -- -- and a threat and I'm John -- top stories on this Thursday may fifteenth. President Obama is -- New York for dedication ceremonies for the 9/11 museum. Among the powerful images on display the so called survivor's staircase which hundreds of people use to escape out of the World Trade Center complex to safety. The museum opens to the public next Wednesday but those opening day tickets are already sold out. And the government have launched a major investigation into tire safety in the wake of a series of deadly accident. An ABC news investigation has revealed a badly flawed government recall system that's kept both motorists and retailers in the dark about a hidden danger. Tires for sale as much as fifteen years old. Millions of unsafe tires could be on the road and there's no legal age limit but even the Big Three auto makers recommends tires older than sixty years be replaced. Police in California say missing radio legend Casey case and has been found in Washington State judge had ordered an investigation into -- whereabouts after his family expressed concern. The 82 year old suffers from Parkinson's disease and can no longer speak his daughters had complained there are being kept away from case -- by his wife Jeanne. And that bidding a fond farewell to a broadcasting legend and friend ABC through a huge party for Barbara Walters last night at the four seasons restaurant here in New York. She was joined by Disney C -- Bob Iger and former New York City mayor Michael Bloomberg. Current and former cohost of the view are also on hand to celebrate including Jenny McCarthy's Star Jones Joy Behar and Whoopi Goldberg. -- Barbara had the lion of the light of the night saying it being so honored -- kind of like having your obituary and being alive to see. -- one best suspect and of course we say congratulations to her as well. Gephardt is any -- -- -- -- -- column -- -- friends and I'm John Mueller thanks for watching. This is ABC's world news now available anytime anywhere you want to -- -- -- NBC news. This America's number one source.