He says that package was brought into the kitchen where it detonated, killing a 17-year-old boy and injuring the woman.
Manley said investigators know what kind of explosive device was used, but police are not revealing details in order to preserve the integrity of the investigation.
The woman injured by the blast was rushed to the hospital where she is being treated for serious injuries.
Police say their investigation of deadly package bombings at two Austin homes will try to determine if a hate crime was involved because the victims in both cases were black.
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Police said that the initial evidence and descriptions of the packages in both cases were similar but did not provide specifics on the appearance of the package. Police said the package in the first home explosion on March 2 was not connected to a specific carrier or vendor, and are reviewing other carriers besides the U.S. Postal Service for Monday's package.
A teenager was killed and a woman was seriously injured when a package exploded at a home in Austin on Monday, marking the second such explosion this month at a home in Texas' capital city.
The FBI told ABC News that it is responding to the reported explosion and assisting Austin police, who are the lead agency handling the situation.
The latest explosion occurred about five miles from the Austin Convention Center, the site of South by Southwest activities on Monday. Anthony Stephan House, 39, was killed March 2 when a package exploded at his northeast Austin home, KEYE reports.