Mark Memmott

This is one of the weekend's saddest stories.

Investigators are trying to determine what caused a horrific fire inside a limousine late Saturday night on the San Mateo Bridge over San Francisco Bay. A new bride and four of her friends — all women — died as they tried to escape. Four other women, who had also been celebrating Neriza Fojas' recent marriage, managed to escape. So did the driver.

As The San Francisco Chronicle says:

Good morning.

Our early headlines:

-- Boston-Area Cemeteries Say No To Burying Bombing Suspect.

-- Syrian Rebels May Have Used Sarin, U.N. Investigator Says.

Update at 1:55 p.m. ET: White House Is "Highly Skeptical":

At the White House this afternoon, spokesman Jay Carney said the U.S. is "highly skeptical" of the comments made over the weekend by international prosecutor Carla del Ponte, who said there are "strong, concrete suspicions but not yet incontrovertible proof" that rebels in Syria have used sarin gas.

We've been covering del Ponte's comments, and the reaction to them, through the day. Scroll down to see an earlier update and our original post.

Officials in Cambridge, Mass., have urged the family of deceased Boston Marathon bombings suspect Tamerlan Tsarnaev not to ask that he be buried in a city-owned cemetery. Meanwhile, at least four private cemeteries in the area have already turned down such a request.

(Most recent update: 10 a.m. ET.)

The nation's jobless rate edged down to 7.5 percent in April from 7.6 percent in March and employers added 165,000 jobs to their payrolls last month, the Bureau of Labor Statistics reported Friday morning.

"Former Kris Kross rapper Chris Kelly had taken a mixture of cocaine and heroin the night before his death and had a history of drug abuse, according to a police report released Thursday," The Atlanta Journal-Constitution reports.

The newspaper adds that:

An American military refueling plane crashed Friday in Kyrgyzstan, according to that nation's emergencies ministry.

The Associated Press says "there was no immediate word on any casualties."

Update at 8:35 a.m. ET. Better Than Expected:

165,000 Jobs Added In April, Jobless Rate Fell To 7.5 Percent

Our original post:

Warren Buffett, the billionaire investor known as the "oracle of Omaha" and renowned for making lots of money for both himself and his Berkshire Hathaway shareholders, joined Twitter on Thursday.

The heartbreaking death of a 2-year-old Kentucky girl who was shot and killed Tuesday by her 5-year-old brother with a rifle he had been given as a gift might lead to criminal charges.

The Lexington Herald-Leader writes that "Kentucky State Police said Wednesday it is too early to say whether charges will be filed in the case of a 5-year-old boy who accidentally shot and killed his 2-year-old sister."

Penny Pritzker, one of the nation's richest people and a "longtime political supporter and heavyweight fundraiser," as The Chicago Tribune writes, is President Obama's choice to be his next secretary of commerce.

The president announced the news this hour at the White House. He also said that one of his economic advisers, Michael Froman, is his choice to be the next U.S. trade representative.

As the investigation continues into the April 15 bombings at the Boston Marathon and the crimes that followed, more names are being added to the story. Here's a guide that we'll keep updating, with links to relevant posts or stories. As always, if new information comes in that changes what is being said about anyone, we will pass that along:

THE VICTIMS

There were 324,000 first-time claims for unemployment insurance last week, down 18,000 from the previous week's 342,000, the Employment and Training Administration reports.

Claims continue to run around the lowest pace since early 2008 — they haven't been lower since a week in mid-January 2008 when they came in at 321,000.

Update at 8:10 a.m. ET, May 3. A New Post: