National News from NPR

As Obama boarded Marine One on the South Lawn of the White House on Friday, he didn't return the salute of the Marine standing at the base of the stairs.

Obama realized it once he got into the helicopter, so he turned around and shook the Marine's hand. Here's video of the moment:

As happens with anything to do with the presidency, Obama's forgetfulness unleashed scrutiny and criticism.

Two freight trains collided in Scott County, Mo., early Saturday morning, leaving seven injured and collapsing an overpass.

KMOV-TV reports:

"Scott County Sheriff Rick Walter says a Union Pacific train t-boned a Burlington Northern train that had just made it through an intersection.

"The collision caused one of the trains to derail and hit a pillar under the overpass causing it to collapse. At least a dozen train cars derailed.

You've gotta feel for Detroit right-hander Anibal Sanchez.

He was cruising toward a no-hitter against the Minnesota Twins Friday night. It was the ninth inning, two outs to go, the count was 1-1 on Joe Mauer.

For his 121st pitch, Sanchez hung a pitch over the heart of the plate. Mauer delivered a bullet to center field, spoiling Sanchez's no-hit bid.

Authorities in Moore, Okla., just released some of the calls that were made to 911 during the EF-5 tornado that devastated the city.

They're harrowing and they offer a glimmer of the chaos and emotion that followed the storm.

During one of the calls, a man tells the dispatcher that the tornado has "cremated" a daycare.

"We need help bad," the man says. You can hear the sounds of children crying in the background. "We need help bad. We got tons of babies in here."

A fire onboard a school bus left at least 15 children dead in Pakistan Saturday morning.

The New York Times reports the private school bus caught fire near the town of Gujrat, when the driver tried to switch from using gasoline to natural gas.

NPR's Bob Mondello and Susan Stamberg read excerpts of two of the best submissions for Round 11 of our short story contest. They read Snowflake by Winona Wendth of Lancaster, Mass., and Geometry by Eugenie Montague of Los Angeles. You can read their full stories below and find other stories on our Three-Minute Fiction page or on Facebook.

Host Scott Simon catches up on the week's sports with NPR's Tom Goldman.

Hundreds of volunteers have come to Moore, Okla., to help the community following Monday's tornado. Some are helping clear debris, others bringing out water and supplies to people whose homes were damaged or destroyed, and whose lives are in disarray. One group of volunteers is cooking more than 10,000 meals a day.