Shooting outside White House, Chemical leak in California, Curbing Ebola spread, CBS News radio off the air, and more.

The White House was put on lockdown after gunshots were heard outside - sending journalists scrambling to seek shelter. The US Secret Service says a suspect was shot dead, and a bystander was also shot. We have the latest details.Also: A large chemical tank in Southern California is at risk of exploding at any moment. It's triggered a state of emergency and the evacuation of tens of thousands of people. Crews are now racing the clock to cool it down before it ruptures. And: Since 1927, CBS News Radio has kept millions of Americans informed. Its had extensive reporting on everything from the Great Depression to the 2008 recession, the Second World War to the War with Iran. But now, CBS News Radio has signed off for good. We'll take a look at its legacy.Plus: South Korean submarine lands in B.C., Hezbollah's use of drones, Animal therapy in Gaza, and more.