Update: National Weather Service confirms tornado that hit Moore, Okla., was a top-of-the-scale EF-5 - @AP

Fatalities confirmed at Plaza Towers Elementary School in Moore, Okla., officials say; no details given - @NBCNews

At least 10 fatalities reported from tornadoes in Oklahoma, medical examiner's office tells @NBCNews

State medical examiner's office: 37 killed in Oklahoma tornado; death toll expected to rise - @AP

Reports of major damage in Moore, Oklahoma; tornado weakening but still capable of damage - @NEWS9

Yahoo to buy online blogging service Tumblr for $1.1 billion in cash, company says - @Reuters, @AP

More: Obama says acting IRS commissioner has resigned; says safeguards to be put in place - live video

More: Obama says acting IRS commissioner has resigned; says safeguards to be put in place - live video

Minnesota Gov. Mark Dayton signs bill legalizing gay marriage; 12th state to do so - @AP

Abortion doctor Kermit Gosnell, convicted of killing babies, to waive appeal, is spared death penalty - @AP

More: US Attorney General Holder orders investigation into IRS targeting scandal - @washingtonpost

Holder announces IRS investigation

Philadelphia abortion doctor Kermit Gosnell found guilty on 3 counts of first-degree murder - @NBCPhiladelphia

Jury finds Jodi Arias guilty of first-degree murder in death of ex-boyfriend - live video