KNOW IT ALL: Thursday's Top 5 Stories at NBC News

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Good morning. Here are some of the stories we’re following today:

1. Manhunt continues for two suspects in France massacre

The massive search for two of three suspects in the terror attack on the Paris magazine Charlie Hebdo that left 12 dead continued Thursday as police appealed for tips from the public. Authorities identified the suspects as heavily-armed brothers Cherif Kouachi, 32, and Said Kouachi, 34, warning that the pair should be considered "armed and dangerous." Cherif has a history of funneling jihadi fighters to Iraq and was convicted of terrorism offenses in 2008. The youngest of three suspects in the atrocity, 18-year-old Mourad Hamyd, surrendered at a police station near the eastern border with Belgium. The weekly magazine has been the target of other attacks for publishing satirical cartoons of the Prophet Muhammad. Read more in NEWS.

2. More violence in Paris as country mourns victims

A female police officer was killed in a Paris suburb Thursday morning amid the manhunt for the suspects in Wednesday's magazine attack. Her death, however, isn't believed to be connected to Wednesday's massacre. Additionally, France has raised its terror alert system to the maximum and bolstered security at media offices, places of worship and other sensitive areas with possible threats of more violence. Meanwhile, French President Francois Hollande declared Thursday a national day of mourning for the victims, which included editor and cartoonist Stephane Charbonnier. Hollande has pledged to hunt down the killers, and pleaded with his compatriots to come together in a time of insecurity and suspicion. Read more in NEWS.

3. Arctic blast shuts down some schools as temps plunge

How low will this go? The bitter blast of cold air continues again Thursday with subzero temperatures — or at least the feeling of them, thanks to wind chills — across about two-thirds of the U.S. As of early Thursday, it felt like 2 degrees below zero in Birmingham, Alabama, and zero in Atlanta. The wind chills in the Midwest and Northeast were downright brutal — 25 below in Madison, Wisconsin, and 36 below in Caribou, Maine. Public school systems in several major cities announced that classes were canceled Thursday, including in Boston, Chicago and Cleveland. Read more in NEWS.

4. Florida girl fatally thrown off bridge by father

Police retrieved the body of a 5-year-old girl tossed off a St. Petersburg bridge early Thursday by her own father. While authorities determine a motive, the dad — identified as 25-year-old John Jonchuck Jr. — was booked into the Pinellas County Jail and faces first-degree murder, among other charges. The girl's body was recovered after 1 a.m. ET, police said. Attempts to resuscitate her were unsuccessful and she was pronounced dead less than two hours later, police spokeswoman Yolanda Fernandez told NBC News. Read more in NEWS.

5. Cosby returns to stage as more accusers come forward

Comedian Bill Cosby said he had a "wonderful time" on Wednesday night after performing for an audience in Kitchener, Canada — getting a warm standing ovation despite a small protest outside. His turn in the spotlight came just hours after three more women claimed they were sexually assaulted by Cosby in past decades. Some 20 women — including supermodels Beverly Johnson and Janice Dickinson — have accused Cosby of sexual assault, and some alleged they were drugged and raped decades ago. Cosby's lawyers have denied the accusations, and accused at least one of trying to extort him. In response, some venues have cancelled his performances. Read more in POP CULTURE.