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The residents found the packages outside their houses, but none was delivered by the Postal Service or delivery services like UPS or FedEx, police said.See also: FBI, police investigate deadly explosion in Austin, Texas - 2nd linked occurrence this month
All residents of Austin should be careful about packages, Manley said. Investigators have not come up with a motive, and he did not say if anybody has claimed responsibility. It's not known if the victims knew each other or if they were targeted, he said.
SXSW began Friday in downtown Austin, bringing in thousands of people to the state capital. The explosions were not in the immediate vicinity of the festival and authorities say the bombings don't appear connected to the festival.
Manley said the packages are "average sized delivery boxes, not exceptionally large" that the residents found outside their houses.
"These are very powerful devices," he said, declining to be specific. "There's a certain level of skill required to move a device like this."
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