D.C. Council Chairman Vincent Gray just released his official statement regarding today’s arrest of Jim Graham chief-of-staff Ted Loza on bribery charges: “Consistent with the standard practice in criminal investigations not to reveal in advance the issuance or execution of an arrest warrant or a search warrant, I was not made aware of the arrest of Mr. Loza nor the search of his office in the John A. Wilson Building before that happened. I will…