Investigators are looking into the cause of what they call a "suspicious" fire that heavily damaged the Cave Junction post office.

12:30 p.m. Investigators are looking into the cause of what they call a "suspicious" fire that heavily damaged the Cave Junction post office.

The fire was reported at about 1:30 a.m. at the post office in the 100 block of South Hussey Avenue, Oregon State Police reported. Firefighters from Illinois Valley Fire District and Rural/Metro Fire Department responded to the fire that caused extensive damage to the single level structure. A passenger vehicle parked near the building also was damaged.

An OSP detective from the Arson Unit and an inspector from the U.S. Postal Inspection Service are continuing the investigation into the cause of the fire.

Police ask anyone with information about the case to call OSP Detective Galen Couch at 541-618-7996.

8:30 a.m. U.S. Postal Service officials have confirmed the post office in Cave Junction burned down overnight.

"It's my understanding the building's a total loss," said USPS spokesman Peter Hass.

Grants Pass Fire officials confirmed crews from Illinois Valley Fire and Rural/Metro Fire responded to the blaze, at 102 S. Hussey Ave. Other details on how long it took to extinguish, the cause, and any injuries are not yet known.

Hass added PO Box customers will be able to pick up their mail in Selma. It's not yet known where other mailbox customers will receive their mail.

"We will be giving them information updating them," Hass said.

We will have more updates on this story as information becomes available.

— Ryan Pfeil