Rain “flash-freezing” on roads, sidewalks and commuter train platforms made travel hazardous in the north-eastern US on Sunday, leading to several highway closures and accidents that claimed at least four lives.

State police in Philadelphia said a crash involving 30 to 50 vehicles on Interstate 76 early on Sunday killed one person, and two others died in a crash involving multiple vehicles on Interstate 476. In Connecticut, police cited slippery conditions in a crash that killed an 88-year-old woman.

Freezing rain and snow was expected in interior parts of New England. Along the coast, fans attending the AFC Championship Game between the Patriots and Indianapolis Colts can expect rain.

On the West Coast, high winds left tens of thousands of customers without power in the Seattle area, where the Seahawks are playing the Green Bay Packers in the NFC title game.