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Also: NSA is searching "vast amounts" of Americans' emails, New York Times reports; winning tickets for huge Powerball jackpot sold in Minnesota and New Jersey; rare Sumatran tigers born at Washington's National Zoo.

Pakistani intelligence officials say Sangeen Zadran, a commander of the al-Qaida-linked Haqqani network, was killed in North Waziristan.

Also: Syrian conflict's humanitarian toll is "staggering;" MIT does some soul searching after Aaron Swartz's suicide; Robert Roberts plans to soon be back on Good Morning America; final four teams are set in NFL playoffs.

Also: An Italian court orders a murder retrial for Amanda Knox; North Korea issues a bellicose statement, warning of attacks on U.S.; Russian oligarch Boris Berezovsky apparently died by hanging; and the world's longest dodgeball game may have set a world record.

Also: Texas officials are on high alert after prosecutor's death; drug maker Novartis loses a patent battle in India; Colorado prosecutors will say whether they plan to pursue death penalty in theater shootings.

Also: Toys 'R Us files for bankruptcy protection; Senate Republicans try again to replace Obamacare; and there are 250 new words in Merriam-Webster's dictionary.

Also: CVS moves to buy Aetna, the U.S. and South Korea begin huge air military drills, and an Australian lawmaker proposes to his partner as same sex marriage legislation is introduced.

Also: The U.S. blames North Korea for a massive ransomware attack last May; and Britain's new aircraft carrier, the HMS Queen Elizabeth, has sprung a leak.

Also: Duck Dynasty star says he's a lover, "not a hater;" fears grow of civil war in South Sudan; winter weather continues to wreak havoc; Apple lands a big deal in China; and Utah officials will try again to halt same-sex marriages.

Also: In video, commander of Syria's military police says he has defected; Egypt has a new constitution; gunman in Western New York left note saying that killing is "what I like doing best;" actors Jack Klugman and Charles Durning have died.