GM to cut 4,000 more white-collar jobs by year end

General Motors has notified its U.S. white-collar workers that it plans to cut about 4,000 more jobs by the end of the year.

Company spokesman Tom Wilkinson says workers on Tuesday were offered standard severance packages as well as chances to retire early if they're near retirement age. But some departures will be involuntary.

GM already has cut about 2,600 salaried jobs this year. It plans to reduce its salaried work force from just over 27,000 to 23,500 by Dec. 31.

The Detroit automaker is operating under bankruptcy protection and has received about $20 billion in government loans.