The John Peter Smith Health Center was shut down for about four hours, the Fort Worth Star-Telegram reported.
A SWAT team and hostage negotiators were sent to the clinic after the 8 a.m. telephone call, police said. The caller claimed a man had come to the clinic with a "long gun."
Employees locked themselves into a secure area at the clinic. Just before noon, police searched the clinic and turned up nothing suspicious.
2014: The Year in Music [PHOTOS]