Two men have been arrested in the killing of a teenage boy over an iPad in Las Vegas, police said Sunday.

The latest high-stakes court hearing for O.J. Simpson in the glitzy capital of big gambles has come to a close with the former football star's defense team feeling confident that their client is closer to getting out of prison.

In a commencement address at Atlanta's historically black Morehouse College, President Obama said graduates should "find time to defend the powerless." The president said his own success was due to "the special obligation I felt, as a black man like you, to help those who need it most, people who didn't have the opportunities that I had — because there but for the grace of God, go I.

Authorities say tornadoes have touched down in Wichita, Kan., and a suburb of Oklahoma City but there are no immediate reports of injuries or significant damage.