Wal-Mart Stores Inc. has alleged that one of its largest insurers is attempting to pull out of its obligation to pay into the settlement reached between the retail giant and comedian Tracy Morgan over a New Jersey Turnpike crash in which a Wal-Mart truck slammed into a van carrying the entertainer and others.

In papers filed in the U.S. District Court for the District of New Jersey on Oct. 12, lawyers for Wal-Mart said two subsidiaries of the carrier, Liberty Mutual Insurance Co., are seeking a declaration that they are not obligated to reimburse Wal-Mart for losses covered in the settlement.