NPR News

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.

In Arizona, a federal judge ruled against the Maricopa County Sheriff's Department, saying it used racial profiling to enforce the state's tough immigration laws. Host Scott Simon talks with NPR's Ted Robbins about the ruling.

Host Scott Simon speaks with Val Castor, the senior "StormTracker" for News 9 in Oklahoma City, about what it's like to do the job in one of the most climatically volatile regions of the country.

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."

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors and musicians, and often includes excerpts from live in-studio concerts. This week:

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.

Nearly 18 million tourists descend on our nation's capitol every year, and most of them are keen to spend time at the many free museums in Washington, D.C. But only about 100,000 people take the trip across the river to a museum of a different sort: the Pentagon. The Pentagon's exhaustive historical displays offer fresh insight into the range of the Defense Department's activities.