Adam Opel GmbH, a unit of General Motors Corp. (GM) Tuesday declined to comment on reports GM's restructuring plan could result in some European plant closures.

"We don't comment on speculation," an Opel spokeswoman said.

Her comments follow a statement Monday from EEF, a European Workers' Council, saying GM's restructuring plan could result in massive layoffs and plant closures.

General Motors Corp. will hold a press conference around 2300 GMT Tuesday, the spokeswoman confirmed.

Company Web site: www.opel.de

-By Frankfurt Bureau; Dow Jones Newswires; +49 69 29 725 500; djnews.frankfurt@dowjones.com