The Hill News

Homeland Security Secretary Janet Napolitano confirmed Saturday morning that the investigation is ongoing into who is responsible for trying to send explosives to the United States on a cargo plane in a plot thwarted Friday. 

"Well, it's certainly an ongoing investigation," Napolitano said this morning on CNN. "And in addition to the two packages that we had specific information about, we have put in place enhanced protections for cargo and passengers emanating from Yemen and making sure that we identify particularly all packages that are coming from there."

She said federal authorities weren't aware of any other packages left to be found but said the were acting with "an abundance of caution."

Napolitano said authorities haven't been able to determine how the explosive devices, which were apparently directed at two synagogues in Chicago, were going to work. 

"That is an unanswered question," she said. 

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