IBM, one of the Triangle’s largest employers, is instituting another round of layoffs across its North American operations.

The extent of the cuts in this region is not clear. New York-based IBM employs about 10,000 people at its Research Triangle Park campus.

The layoffs began Thursday morning and affect employees within IBM’s Global Business Services division, according to a labor union trying to organize IBM’s workers.

“Right now we’ve got probably about 250 people we know were cut; we expect that number to climb,” said Lee Conrad, national field coordinator of Alliance@IBM.