Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech in 1963 at the Lincoln Memorial in Washington.

Your daily look at late-breaking news, upcoming events and the stories that will be talked about today:

1) UN ENVOY TO SYRIA SAYS CHEMICAL 'SUBSTANCE' USE

Lakhdar Brahimi says evidence suggests that some kind of chemical "substance" was used that may have killed more than 1,000 people.

2) WHITE HOUSE PROMISES PROOF

The release of an intelligence report formally linking Assad to the purported chemical attack could come as early as today.

3) FIFTY YEARS AGO, KING DELIVERED 'I HAVE A DREAM' SPEECH

Obama says in a radio interview that he imagines the civil rights leader "would be amazed in many ways about the progress that we've made."

4) FORT HOOD GUNMAN RESTS CASE

In his last chance to plead for his life, the Army psychiatrist decides not to submit evidence, call witnesses or testify.

5) WHY YOSEMITE WILDFIRE GREW SO BIG SO FAST

The region hasn't seen a significant forest fire since perhaps the 1910s. That's left a century's worth of fuel in the blaze's path.

6) NUKE THREAT LEVEL RAISED

Japan upgrades the leak of 80,000 gallons of radiation-contaminated water at the tsunami-wrecked Fukushima plant to a "serious incident."

7) WHO'S TAKING RESPONSIBILITY FOR DISRUPTING NY TIMES' WEBSITE

A shadowy group of pro-Assad hackers known as the Syrian Electronic Army says it launched the cyberattack - and a similar assault on Twitter.

8) SCIENTISTS SAY EXISTENCE OF NEW ELEMENT CONFIRMED

The short-lived by super-heavy element has been dubbed "ununpentium." A catchier name is likely coming.

9) HOW FINANCIAL MARKETS ARE REACTING TO POSSIBLE SYRIA STRIKE

The Dow falls 170 points, Asian stocks plunge and the price of oil soars.

10) LITTLE-KNOWN AMERICAN SHOCKS EX-CHAMP

Seventeen-year-old Victoria Duval, who's ranked 296th in the world, knocks off Samantha Stosur at the U.S. Open. Stosur won the tourney in 2011.