Francisco's Financial District this morning, prompting street closures below while crews try to secure it, a fire official said.
The rig was reported hanging unsafely at 7:02 a.m. from the 41st floor of a building at 301 Clay St., according to the fire official.
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As a precaution, police closed Battery Street between Sacramento and Clay streets and also shut down the 28th through 30th floors of the building, the fire official said.
San Francisco Municipal Railway buses on the 1-California and 41-Union routes are being rerouted around the scene, Muni officials said.
Crews were still working to secure the rig as of 8 a.m.