UPDATE 11/4/11 @ 1:45 p.m.
RANSON, W.Va. (AP) - Authorities say they have found no sign of a reported explosion inside a small-town post office in West Virginia and no sign that white powder sprayed out.

The scare prompted officials to quarantine 15 postal workers Friday, though none showed signs of illness.

Ronald Fletcher, a firefighter with Citizens Fire Company, is the designated spokesman for the case at the U.S. Post Office in Ranson.

Fletcher says workers reported a package had exploded in a storage locker about 7:45 a.m. But the package in question remains intact. It will now be X-rayed.

The workers, sheltered in a school bus, are being interviewed.

Fletcher says a robot tested the air for chemical agents, and the result came back negative.

Residents in the area were told to stay inside as a precaution.

The scare prompted officials to quarantine 15 workers Friday, though none have shown signs of illness.

Ronald Fletcher, a firefighter with Citizens Fire Company, has been designated the spokesman about the incident at the U.S. Post Office in Ranson. He says a robot inspected the air for chemical agents, but so far the tests are coming back negative.

Fletcher says the quarantined workers were being sheltered inside a school bus. Residents in the area were told to stay inside as a precaution.

Employees told police they heard a pop and then saw a shower of white powder about 7:45 a.m.

Firefighter spokesman, Ronald Fletcher says that 15 people were quarantined but showed no sign of illness.

Fletcher says employees told police there was a "pop," then a shower of white powder. He did not know what the powder was.

The incident occurred about 7:45 a.m. Friday at the U.S. Post Office in the small town of Ranson.

Neither Jefferson County emergency services nor State Police would immediately comment, but the Special Operations division says it has bomb technician at the scene.

A robot has been sent inside to test the air.

Postmaster Steve Parrill says that about 20 people work at the branch.