A spate of mysterious booms that has been shaking central Oklahoma returned for a second day Friday, again rattling houses and frightening livestock.
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Oklahoma Geological Survey research seismologist Austin Holland said a series of booms, much like a sonic boom, rattled the Norman area starting at 11:19 a.m. Friday. Numerous others had been reported Thursday in the same area at about the same time.

Friday’s booms weren’t “quite as frequent” as Thursday’s, Holland said. “It’s quite interesting.”

The windows of Anthony Young’s home in the town that’s the outskirts of Oklahoma City rattled.