Caitlin Dickerson

The killing of Alton Sterling, 37, by police earlier this week touched off protests across the country – but in Sterling's home city of Baton Rouge, La., demonstrators' outrage has rarely exceeded a parboil. And that's by design.

In its broad outlines, we know this story: mass shooting, dozens dead, more injured.

But authorities are still trying to piece together exactly what happened at Pulse nightclub in Orlando, Fla., nearly a week ago, in what is the deadliest mass shooting in modern U.S. history.

The chaos unfolded quickly inside the nightclub late Saturday night, where Omar Mateen gunned down 49 people and injured more than 50 others.

Sen. Claire McCaskill, D-Mo., plans to introduce legislation today to help World War II veterans who were exposed to mustard gas. The vets were used in classified experiments conducted by the U.S. military, and were sworn to secrecy about their participation for a half-century.

Charles "Lindy" Cavell could never forget what the U.S. military tried to hide. Cavell fought to bring to light the secret mustard gas testing program he had participated in during World War II and for VA compensation for the test subjects. He died at home Wednesday at 89.

Sen. Claire McCaskill, D-Mo., had strong words for Department of Veterans Affairs Secretary Robert McDonald on Thursday regarding the VA's failure to compensate thousands of World War II veterans who were exposed to mustard gas.

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