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Know It All: Thursday's top stories at NBC News

David Lom / NBC News

NBC News' Ann Curry interviews Iranian President Hassan Rouhani on Wednesday.

Here are some of the top stories we're following Thursday at NBC News:

Iran's president blames Israel for 'instability,' calls for peace in exclusive interview
Speaking in an exclusive interview with NBC News' Ann Curry, Iranian President Hassan Rouhani said Israel has caused "injustice to the people" of the Middle East and pleaded for peace, saying Iran is not "looking for war." Read more at NBC News.

Navy Yard reopens as investigators look into shooter's motive, history
Three days after gunmen Aaron Alexis went on a horrific rampage at the Washington Navy Yard, killing 12 people and wounding several others, the Washington, D.C., military installation reopened Thursday morning. It will be a regular work day, although the building where the shootings happened is closed. Read more at NBC News.

Number of missing in devastating Colorado floods drops as property loss soars
The number of people unaccounted for after Colorado's monstrous flooding has dropped dramatically as rescuers reach stranded victims. Meanwhile, property losses are expected to total nearly $2 billion, a catastrophe modeling firm said. Read more at NBC News.

Jackpot! Someone in South Carolina wins $400 million Powerball prize
A single winning ticket was sold for the blockbuster $400 million Powerball drawn Wednesday — one of the biggest prizes in U.S. lottery history, officials said. The one grand prize winner was purchased in South Carolina. Read more at NBC News.

New sonar equipment is helping to solve some very soggy cold cases
State-of-the-art sonar imagining technology is aiding police offers in southwestern Oklahoma as they try to solve a pair of decades-old cold cases. Read more at NBC News.

Former heavyweight champ Norton, who beat Ali, dead at 70
Ken Norton, who beat Muhammed Ali and later lost a controversial decision to him in Yankee Stadium, died Wednesday at a Las Vegas care facility, according to the Associated Press. He was 70. Read more at NBC Sports.