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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: Trial to start on BP's responsibility for Gulf oil spill; South Korea's first female president takes office; Cuban leader Raul Castro says he'll retire in 2018; Argo wins Oscar for best picture.

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.

Also: A study shows more young kids get small screen time; a suspect in shootings in 2 states is arrested; and there's a report that some Iditarod dogs tested positive for a banned drug.

Also: A Vietnam vet and medic who saved dozens of lives will receive the Medal of Honor; Sen. Schumer (D-N.Y.) seeks a CEO for Puerto Rico disaster recovery; and David Letterman wins the Twain Prize.

Also: New power outages in Puerto Rico follow a substation fire; South African President Jacob Zuma clings to power; and models shed clothes for body paint in New York's Polar Bear Paint event.

Also: Afghanistan's leader calls for unconditional talks with the Taliban; Southern California officials fear mudslides and call evacuations ahead of a storm; and Barbra Streisand clones her dog.

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: Fidel Castro's oldest son reportedly takes his life; oil from a sunken oil tanker in the East China Sea may be washing up in Japan; and thousands of possible Mayan structures are discovered.

Also: Vice President Mike Pence says the U.S. is ready to impose tough new North Korea sanctions; Germany may be closer to forming a coalition government; and Olympic workers fall ill with norovirus.