“Safety concerns” led to the temporary closure of a Northampton County post office Friday, representatives of the United States Postal Service said. The Treichlers Post Office, 331 E. Breadfruit Drive in Lehigh Township, is shuttered as a result of the issue. USPS representatives made the announcement in a news release posted on the postal service’s website. Representatives did not provide specifics about the issue and there was no timeline on when the regional office may reopen.