A volcano in Iceland began erupting Sunday, sending lava into the nearby fishing town of Grindavik. Nobody was hurt, as the town was evacuated overnight. Source

Iowa high school principal Dan Marburger, who shielded students during a shooting at the school earlier in January, has died, his wife said on social media. Source

The Iowa caucuses mark the first contest in the 2024 presidential election. Ed O’Keefe explains how the system works. Source

Ukrainian President Volodymyr Zelenskyy is set to travel to Switzerland to ask for more aid in his country’s fight against the ongoing Russian invasion. The U.S. has supplied Ukraine with some $40 billion in aid since the war began two years ago, while Russia is being supplied by North Korea and Iran. Chris Livesay reports. Source

U.S. officials say they have been pressuring the Israeli government to change its tactics in Gaza as the war with Hamas threatens to spill over into a wider regional conflict. Skyler Henry reports. Source

With the Israel-Hamas war entering its 100th day, there is growing international concern about the increasing civilian death toll in Gaza as Israeli Prime Minister Benjamin Netanyahu vows to continue the assault. Meanwhile, vigils were held in Israel in support of those who remain held hostage in Gaza. Charlie D’Agata reports. Source

Republican candidates rallied supporters across Iowa on Sunday in preparation for Monday’s caucuses. Freezing temperatures and snow forced many candidates to change their plans and are raising some fears over turnout. Robert Costa reports. Source

Nearly 100 million Americans were under wind chill warnings or advisories on Sunday as bitter cold and heavy snow swept through the country. The Weather Channel meteorologist Mike Seidel takes a look at the extreme weather. Source

Zadroga, a former police chief, spearheaded an initiative that brought health screenings and financial aid to sick 9/11 first responders. Source

Here’s a look at the top stories making headlines on the “CBS Weekend News” with Jericka Duncan. Source