DETROIT General Motors' global head of manufacturing, Gerald Johnson, said in a video statement released on Tuesday the demands received from the United Auto Workers union have “significant costs attached that would threaten our ability to maintain our manufacturing momentum.”

Johnson appeared in the video with GM President Mark Reuss. Both executives reiterated they want to reach a "fair" agreement without a strike. The executives did not detail GM's economic proposals to the UAW.

(Reporting By Joe White; Editing by Leslie Adler)