President Barack Obama waves as he walks toward Marine One while departing the White House, on September 5, 2012 in Washington, DC. President Obama is traveling to Charlotte, North Carolina where tomorrow he will officially accept his presidential nomination at the 46th Democratic National Convention. (Photo by Mark Wilson/Getty Images)
NBC Philadelphia – The Secret Service and Philadelphia Police are working together to investigate a threat against President Obama.
Officials say a 911 call threatening the President was made Tuesday around 11:50 p.m. in Philadelphia.
They also say it came from a phone located on the 100 block of East Cumberland Street in Kensington.
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