Newt Gingrich unleashes a fiery ad attacking his rival while Romney appealed to Florida?s Hispanic voters. NBC?s Peter Alexander reports. (Nightly News)

When U.S. combat troops came home from Iraq, there was little public fanfare. Today in St. Louis, a crowd estimated at about 100,000 tried to change that thanks to a grassroots effort. NBC's John Yang reports. (Nightly News)

LIVE: Rafael Nadal, who has lost six straight matches to Novak Djokovic, tries to the solve the world's top player in the Australian Open men's final.

NBC?s Kate Snow and David Gregory, host of ?Meet the Press,? discuss Newt Gingrich?s campaign plans and growing concerns about the Republican nomination fight. (Nightly News)

The crisis in Syria takes a dramatic turn for the worse as Arab League observers suspend their mission in the country after government forces killed 74 people, including women and children, in one day. NBC?s Ayman Mohyeldin reports. (Nightly News)

Survivors still haunted by memories of last year's tornado outbreak that killed 250 in Alabama are writing checks, donating diapers and standing over hot grills to help victims of the latest twisters to pummel the state.

Senior United Nations nuclear inspectors headed to Tehran on Saturday to press Iranian officials to address suspicions that the Islamic state is seeking atomic weapons.

Etta James was remembered at a service Saturday attended by hundreds of friends, family and fans as a woman who triumphed against all odds to break down cultural and musical barriers in a style that was unfailingly honest.

A fire swept through a two-story private rehabilitation center for addicts in a poor part of Peru's capital on Saturday, killing at least 27 people.

Scores of dolphins that beached on Cape Cod in recent weeks have died, the second time in three months New England has seen a mass of marine mammal deaths.

The embattled president of Yemen arrived in the United States on Saturday for medical treatment, Yemen's foreign press office said.

Tiger Woods may not be the lock he once was, but with a 54-hole lead Woods still looms large. Still, it remains to be seen whether Woods' aura is worth a half stroke per side the way some believe it used to be.

AP - Mitt Romney strode into the final 48 hours of the pivotal Florida Republican primary campaign with the confidence of a resurgent front-runner, predicting he'll win in Tuesday's voting while looking ahead to future contests.

AP - Dozens of police maintained a late-night guard around City Hall following daylong protests that resulted in 300 arrests. Occupy Oakland demonstrators broke into the historic building and burned a U.S. flag, as officers earlier fired tear gas to disperse people throwing rocks and tearing down fencing at a convention center.

AP - Russia's defiance of international efforts to end Syrian President Bashar Assad's crackdown on protests is rooted in a calculation that it can keep a Mideast presence by propping up its last remaining ally in the region — and has nothing to lose if it fails.

AP - Two adults and an 18-month-old boy died when their SUV collided with a light-rail train in Sacramento, moments after the vehicle's driver ignored flashing warning lights and veered around a rail crossing arm, authorities say.

AP - Thousands of supporters in Myanmar's countryside cheered opposition leader Aung San Suu Kyi on Sunday as she made a political tour ahead of by-elections, highlighting how quickly and dramatically politics is changing in the long-repressed Southeast Asian nation.

AP - The head of Iran's state oil company said Sunday that the price of crude will reach $120 to $150 per barrel, as officials in Tehran prepare to discuss a ban on crude sales to European Union countries in retaliation for an EU embargo.

AP - A mythical film starring an 8-year-old girl and a documentary about the war on drugs took top honors at the Sundance Film Festival.

AP - Thousands of people clad in bathing trunks, bikinis and even some woolly winter hats have taken the Polar Bear Plunge into the Chesapeake Bay for charity.

AP - Drew Gooden scored 23 points and the undermanned Milwaukee Bucks made sure the Lakers' road struggles continued, beating Los Angeles 100-89 on Saturday night.

Reuters - Iran said on Sunday it was very optimistic over a visit by U.N. nuclear inspectors aimed at shedding light on suspected military aspects of Tehran's atomic work but suggested Tehran would curb cooperation if the experts became a "tool" for outside powers.

Reuters - Thousands of Syrian soldiers moved into the suburbs of Damascus that have fallen under rebel control on Sunday, killing five civilians, activists said, a day after the Arab League suspended its monitoring mission in Syria because of mounting violence.