Ukraine: A peaceful demonstration turned violent when pro-Russian demonstrators attacked the police station in Odessa. They had gathered to memorialize and protest the deaths 31 fellow demonstrators who were killed Friday inside a union building that burned.

Ukraine’s interim Prime Minister Arseniy Yatsenyuk, has ordered an investigation but also says the unrest is “part of a plan fomented by Russia to destroy Ukraine”. Yatsenyuk admits that the Ukraine government is struggling to maintain control of the country.

National: A gunman in Jonesboro, Ark. Went on a shooting spree killing three people, including a 13-year-old girl, before shooting himself inside his car on a highway. Four other people were wounded. Jonesboro was also the location of a 1998 school shooting in which five people were killed.

>At a memorial for his late girlfriend L’Wren Scott at St. Bartholomew’s Church in New York, Mick Jagger sang a version of Bob Dylan’s “Just Like a Woman”. The fashion designer Scott took her own life in March.

>The Los Angeles Clippers, whose owner Donald Sterling has been banned for life from the NBA, beat Golden State 126-121 to advance to the league’s final four.

Hat Day: California Chrome, the 5-2 favorite, ran away with it on the closing stretch to win the 140^th Kentucky Derby. Chrome is the first California bred horse to win the Derby since 1962. Chrome is owned by Steve Coburn and Perry Martin, a couple of working guys outside Reno who bred the horse for $10,000 and went into the racing business. This is their only horse. Just before the Derby they turned down a $6.1 million offer for 51 percent ownership of what is now a Kentucky Derby Champion.

Smarts: Artificial intelligence could turn out to be one of mankind’s most dangerous inventions, according to Physicist Stephen Hawking and two other scientists. They warn of a day when AI can slip the controls of man. They say in a joint paper, “One can imagine such technology outsmarting financial markets, out-inventing human researchers, out-manipulating human leaders, and developing weapons we cannot even understand. Whereas the short-term impact of AI depends on who controls it, the long-term impact depends on whether it can be controlled at all.”

Drone On: Rangers in Yosemite National Park say the increasing use of radio-controlled aerial drones is endangering tourists and wildlife and just plain ruining the peace and quiet. The use of drones is illegal in Yosemite, but drone lovers seem to be ignoring that. They’ve been posting aerial shots of rock climbers, wildlife, and treetop views. It’s how Americans get back to nature.

DC Comics: President Obama fired the humor gun at his own feet last night at the White House Correspondents dinner, making fun of the troubled Obamacare rollout. He said, ‘‘in 2008 my slogan was ‘Yes we can.’ In 2013 my slogan was ‘Control-alt-delete.’’’

He saved some barbs for the press.

CNN: ‘‘The lengths we have to go to to get CNN coverage these days. I think they’re still searching for their table.’’

Fox News: ‘‘The Koch brothers bought a table here tonight, but as usual they used a shadowy right-wing organization as a front. Hello, Fox News!’’

The event was not quite as studded with big Hollywood stars as in previous years. A few big names were there, but some reports say the A-listers have grown tired of fawning reporters drooling on them during dinner.

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