Spellacy and Mark Carpenter, spokesman for the recycling institute, said the woman wasn't a credentialed convention member and wasn't supposed to have been in the ballroom.
After her speech, Clinton answered questions posed by Jerry Simms, the outgoing chairman of the organization. Simms first offered what he called a "deepest apology for that crude interruption."
Clinton answered questions broadly, saying she felt politics today leads people to "do what they think will be rewarded."
An attendee later handed a reporter a piece of paper that was apparently thrown by the woman. It appeared to be a copy of a Department of Defense document labeled confidential and dated August 1967; it referred to an operation "Cynthia" in Bolivia.
The incident reminded some of former President George W. Bush dodging two shoes thrown by an Iraqi journalist during a news conference in Baghdad in December 2008. Shoe-throwing is considered an insult in Arab cultures.
Clinton, the former first lady and Democratic senator from New York, has been traveling the country giving paid speeches to industry organizations and appearing before key Democratic Party constituents.
During a speech in San Francisco on Tuesday, Clinton said she was seriously considering a presidential bid and all it would entail.
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