HOMER, Alaska (AP) — A trailer containing mail intended for a dozen communities on the Kenai Peninsula caught fire and was destroyed.

The driver of the truck hauling the trailer was not injured in the Tuesday incident, the Homer News reported.

The cause of the fire is under investigation, the U.S. Postal Service said in a statement.

The contract truck left a processing center in Anchorage and caught fire near Mile 38 of the Seward Highway, or just north of the intersection of the Seward and Sterling highways, near Tern Lake.

Mail in the trailer was intended for Kasilof, Clam Gulch, Ninilchik, Anchor Point, Homer, Fritz Creek, Halibut Cove, Nanwalek, Nikolaevsk, Port Graham, Nikiski and Seldovia.

Anyone who believes they were impacted by the lost mail should contact the postal service. If a lost package was insured, a claim can be filed online.

“The Postal Service regrets this unfortunate situation and any inconvenience it may cause,” USPS wrote in a copy of the letter attached to the press statement. “If you are questioned by a mailer, creditor or correspondent regarding mail or packages that may have been destroyed in this fire, feel free to use this letter as explanation.”

The postal service should be able to identify lost mail or packages that had tracking numbers by Wednesday, said James Boxrud, an agency spokesperson.