Good afternoon, Chicago.

Wind chills of up to 15 degrees below zero hit the Chicago area this morning, with the National Weather Service warning of “extreme cold temperatures” throughout the day.

Fluffy, accumulating snow is also expected to blanket the area late tonight through tomorrow morning, particularly near and north of Interstate 80. Roads may become slick during the morning commute.

Here’s what else is happening today. And remember, for the latest breaking news in Chicago, visit chicagotribune.com/latest-headlines and sign up to get our alerts on all your devices.

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3 firefighters among 4 injured at West Town fire

Three firefighters and an adult were injured following a fire last night at an apartment building in the West Town neighborhood, the Chicago Fire Department said.

More top news stories:

• Lawsuits allege shell corporations compound negligence by nursing homes
• 3.8 magnitude earthquake reported in central Illinois
• Burst pipe in air traffic tower causes delays at O’Hare

Critics warn rail merger would give Union Pacific unprecedented role in Chicago and more control of industry

If regulators approve its merger with Norfolk Southern, competitors warn that Union Pacific could turn the city of Chicago into a hammer for seizing even more control of the industry.

More top business stories:

• Uber and Lyft drivers could win union rights if state law changes
• Food costs spiked in December while gas prices cooled. Here’s the latest look at consumer expenses.

Chicago Cubs’ Pete Crow-Armstrong marvels at Bears’ Caleb Williams — and Justin Steele eyes his return

Pete Crow-Armstrong can’t help but marvel at Chicago Bears quarterback Caleb Williams’ athleticism. The Cubs’ 23-year-old center fielder has spent a chunk of the offseason in the city, which included going to a few Bears games.

More top sports stories:

• Illinois guard Kylan Boswell is out until mid-February with a fractured right hand
• Caleb Williams’ teammates say the Chicago Bears QB ‘put it all out there on the line’ this season
• Column: Bears enter offseason after ‘igniting the city’ and restoring faith — but challenges lie ahead

A$AP Rocky announces ‘Don’t Be Dumb’ world tour launching in Chicago

The announcement comes on the heels of “Don’t Be Dumb,” A$AP Rocky’s fourth studio album and first in eight years, released last Friday.

More top Eat. Watch. Do. stories:

• Column: Was tiny Walter Eckersall the city’s greatest football player?
• Review: We can map that: Newberry Library exhibits 500-plus years of borders, folds and graticules

US citizen says ICE removed him from his Minnesota home in his underwear after warrantless search

Federal immigration agents forced open a door and detained a U.S. citizen in his Minnesota home at gunpoint without a warrant, then led him out onto the streets in his underwear in subfreezing conditions, according to his family and videos reviewed by The Associated Press.

More top stories from around the world:

• Top EU official questions Trump’s trustworthiness over Greenland tariff threat
• Trump administration urges judge to reject Minnesota’s attempt to stop its immigration crackdown