(Scroll down to watch the response from Gibbs.)
"Our counter-terrorism and Homeland Security officials take every credible threat very seriously," Gibbs told reporters.
"As you know, there is significant planning for and coordination to prevent unconventional attacks using chemical, biological, or radiological weapons. We will continue to remain vigilant to ensure we're doing all that we can to prevent it."
In his CBS Evening News report, Keteyian explained that the latest terror threat to America involves the possible use of poisons - simultaneous attacks targeting hotels and restaurants at many locations over a single weekend.