Was mysterious sound result of supersonic jet flight?

Dan Tilkin
Katu.com
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Portland, Oregon (US):
The source of those mysterious rumblings over the weekend that caught the attention of so many continues to be a mystery, although there is a focus on a potential answer.
The focus is on F-15s at the Portland Air Base, which KATU News was originally told were on the ground, but we later learned were not.
It turns out a group of F-15s were launched from the Portland International Airport Saturday night as part of three days of intensive training.
Within an hour of their departure, people started hearing things and feeling some rumblings. That is when the 911 calls began.
Even the commander of the F-15 squadron heard the strange noise from his home in Lake Oswego.
The logical explanation seemed to be that the fighter jets set off a sonic boom, but the Air National Guard says it does not make sense that so many people, from Longview to the Oregon coast, would hear the same sonic booms at the same time. A much smaller range of 10 to 20 miles is more likely.
With so many wondering what happened, the Air National Guard is continuing its investigation.
Mar 15, 2006