OKLAHOMA CITY – The Latest on a winter storm that has dumped ice and snow on the southern Plains (all times local):

12:30 p.m.

Authorities say at least four people have died and a police officer has been injured in collisions on treacherous roads as a winter storm moves through Oklahoma and Texas.

The Oklahoma Highway Patrol says a 63-year-old woman died Wednesday evening when her pickup veered out of control on a sleet-slickened road and was struck by a tractor-trailer rig in Pittsburg County.

The patrol says three more people died in two crashes Thursday. A 76-year-old man died after his vehicle slid out of control and struck a tree in Grady County. A Texas man was killed in a collision on Interstate 35 in southern Oklahoma. And a Texas woman died later at a hospital of injuries she suffered in the crash.

In northeast Oklahoma, a police officer is recovering after being struck by a vehicle while working at the site of a crash on a bridge over Interstate 44 in Tulsa

This item has been updated to correct the gender of Wednesday’s crash victim.

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11:25 a.m.

Officials say at least three people have died in collisions on treacherous roads as a winter storm moves through Oklahoma and Texas.

The patrol says two more fatalities occurred Thursday. A 76-year-old man died after his vehicle slid out of control and struck a tree in Grady County, and another motorist died in a collision along Interstate 35 in southern Oklahoma.

The identities of the victims and other details have not been released.

The National Weather Service has issued a winter storm warning through Friday morning for northern Texas and much of Oklahoma.