Our early headlines:
— 'Tragic Day For All Of Belgium': 22 Children Killed In Bus Crash.
— In Afghanistan, Panetta Says Mission Continues.
— 6.9 Magnitude Quake Shakes Japan, But Tsunami Warning Canceled.
— Santorum Wins In Dixie, Romney Takes Hawaii And American Samoa.
— Boston's Back Bay Slowly Recovering After Smoky Fire Causes Chaos.
Other stories in the news:
— "Why I Am Leaving Goldman Sachs." Departing Executive Calls Firm's Culture "Toxic And Destructive." (The New York Times)
— "Obama, Cameron To Get Down To Business On 2nd Day Of Prime Minister's Visit." (CNN)
Related: The two leaders are scheduled to hold a news conference at 12:05 p.m. ET. We'll live blog it.
— "Ahmadinejad Grilled" By Iranian Parliment. (BBC News)