[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/US/10/29/security.concern/story.cargo.update2.jpg caption="The circuit board bears similarities to a cell-phone, according to an engineer for a wireless phone parts manufacturer." width=300 height=169]
CNN Wire Staff
(CNN) - Suspicious packages found in at least two locations abroad that were bound for Jewish organizations in the United States "apparently contain explosive material," President Barack Obama said Friday, calling the discovery "a credible threat against our country."
The packages led to increased searches of cargo planes and trucks in several U.S. cities, said law enforcement sources with detailed knowledge of the investigation.
U.S. officials believe that al Qaeda in the Arabian Peninsula, commonly referred to as AQAP, is behind the incident.
Obama confirmed that the packages originated in Yemen, the stronghold of al Qaeda in the Arabian Peninsula.
"We also know that al Qaeda in the Arabian Peninsula ... continues to plan attacks against our homeland, our citizens, and our friends and allies," he said during a press briefing on the incident.
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