The transportation company responsible for a molasses spill that killed more than 26,000 fish and other marine life in Hawaii says it has been subpoenaed by a federal grand jury for documents relating to the spill.

Matson, Inc. said in a Securities and Exchange Commission filing today that it was served with the subpoena on Thursday. The company says it has also received written requests for information on the spill from two state agencies and the U.S. Environmental Protection Agency.

The spill of 1,400 tons of molasses — enough to fill about seven rail cars — happened in early September in an industrial area about 5 miles west of Waikiki’s hotels and beaches.

Honolulu-based Matson says it doesn’t yet know how much the spill may cost the company.