The escort of Gates, the wealthy businessman and philanthropist, was provided on Nov. 8, 2010 from the city Convention Center to Dulles at a total cost of $445.68, according to an invoice provided to the AP. A Gates spokeswoman said she had no immediate information on the escort.

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The escort of rapper Jay-Z began on March 3, 2010, originating at Dulles and lasting from 3 p.m. to 1 a.m. the next day at a cost of $1,114.20. It's not clear from the invoice where Jay-Z went in D.C, and a publicist for him had no immediate information on it.

D.C. Council member Phil Mendelson, whose committee has oversight of the police department, said he was considering asking for a hearing to hash out the conflicting reports from the agency.

"Most troubling is (the) lack of a consistent story," Mendelson said. "How many conflicting explanations have we gotten from officials regarding what is the truth?"