The Wal-Mart on North Atherton Street was evacuated on Thursday evening for the fourth time since Sept. 24.
Patton Township police responded to the store after a bomb threat was called in. Ferguson Township police also responded.
According to Sgt. Matt Shupenko, of Patton Township police, the store was evacuated shortly after 5:30 p.m.
Police thoroughly searched the store, and the threat was unfounded, he said.
The store reopened shortly after 7 p.m., he added.
Anyone with information about the series of hoax bomb threats is asked to call 800-479-0050.