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A blast Wednesday at the SpaceX rocket testing facility in McGregor was part of a test by accident investigators and caused no damage or injuries, according to a SpaceX spokesman. The noise emanating from the facility southwest of Waco had people posting inquiries on Facebook early in the day.

The city of McGregor confirmed the community’s volunteer fire department responded to the explosion but took no action at the site.

“The sound heard by residents was actually the result of a pressurization test at the McGregor Rocket R&D facility. These tests take place periodically at the site, and this particular test was part of the ongoing testing being conducted by our Accident Investigation Team,” SpaceX spokesman Phil Larson said in an email response to questions. “The volunteer fire department responded as a matter of procedure, but there was no damage to the site or injuries to any personnel.”

SpaceX reportedly is continuing to pursue the cause of the Falcon 9 explosion on Sept. 1 that destroyed an unmanned rocket at Cape Canaveral Air Force Station in Florida before launch.