MINNEAPOLIS (AP) - Transportation officials were closing highways in southwestern Minnesota as a blustery winter storm moved into the state.

The Minnesota Department of Transportation says Interstate 90 remains open. But additional highways maybe closed as blizzard conditions make travel hazardous.

MnDOT advises no travel in southwestern or southeastern Minnesota. No unnecessary travel is advised in northwestern Minnesota due to whiteout conditions and blowing snow.

Slow also was making roads slippery in the Twin Cities. Statewide, the State Patrol reports nearly 590 crashes as of Thursday afternoon.

The National Weather Service has extended a blizzard warning from west-central and south-central Minnesota north into central Minnesota until 3 a.m. Friday.

Minnesota remained in the deep freeze Thursday with morning temperatures below zero and wind chill readings in the negative double digits.