updated 3/27/2011 5:04:35 PM ET 2011-03-27T21:04:35

Authorities say one person was injured when a pipe bomb disguised in a newspaper exploded at a residence in a San Francisco Bay area suburb.

The explosion in Vacaville occurred around 10 a.m. Sunday and forced the evacuation of surrounding homes. The victim was airlifted to a hospital although the extent of the person's injuries was not immediately clear.

Police say the bomb was wrapped in a Sunday newspaper. Investigators apparently discovered one more pipe bomb in the same neighborhood.

They are advising residents within a half-mile radius of the explosion not to approach any package or item delivered Sunday morning.

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Video: Pipe bomb found in No. Calif.

  1. Closed captioning of: Pipe bomb found in No. Calif.

    >>> we are following a developing story, domestic, out of california, where right now police are investigating a pipe bomb that was turnaround in the city of vacaville in northern california . police tell us that one person has been injured and airlifted to a nearby hospital. more than a dozen homes have been evacuated as a result. officials are urging residents in that area to be extremely cautious while this investigation is under way, again taking place in vacaville, california. officials say the pipe bomb was wrapped to try to look something like a sunday newspaper. we're going to keep you updated as we learn new information.

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