10 things to know today

Here's your daily look at late-breaking national and international news, upcoming events and the stories that will be talked about Wednesday, April 17, 2013:

1. BOMBINGS INVESTIGATOR: 'SOMEBODY KNOWS WHO DID THIS'
The FBI appealed to the public for pictures or information that could lead them to arrests in the marathon explosions.

2. WHAT BOMBS IN BOSTON WERE MADE OF
The explosives-builder used kitchen pressure cookers packed with metal shards, nails and ball bearings.

3. WHO SENT POISON-LACED LETTER TO MISSISSIPPI SENATOR
Lawmakers say a person who writes letters often to them is the suspect in the mailing of a letter containing ricin to Sen. Roger Wicker.

4. STEPPED-UP SECURITY FOR THATCHER FUNERAL
World leaders from 170 countries are attending today and 4,000 police officers will secure the route that will take the former prime minister's coffin to a London cathedral.

5. BACKGROUND CHECKS BILL IN PERIL
An Associated Press-GfK poll shows public support for gun control fell from 58 percent to 49 percent as the Senate debates tougher restrictions.

6. AIRLINE PROMISES NORMAL OPERATIONS AFTER COMPUTER CRASH
American Airlines' outage forced it to ground all U.S. flights for hours, leaving tens of thousands passengers stranded.

7. SANFORD IN TROUBLE WITH EX-WIFE
The former South Carolina governor who divorced after admitting an affair was accused of trespassing at her home.

8. MARATHON ANOTHER 'SOFT TARGET' IN U.S.
The AP's Allen G. Breed reports that the Boston bombings join movie theaters, malls and schools as one of many public spaces targeted for mass violence.

9. WHY FOX PULLED 'FAMILY GUY' EPISODE ON BOSTON MARATHON
The March 17 episode removed from websites shows main character Peter Griffin mowing down runners with his car at the race.

10. MADDEN REMEMBERS SUMMERALL AS 'THE VOICE OF FOOTBALL'
The NFL-player-turned -broadcaster, who died at 82 spent half of his four-decade career famously paired with Madden.