Multiple layers of fact-checking update
News of the arrest was first reported by CNN.Not so fast, quick draw.
Boston police are reporting there has been no arrest in the Marathon bombing case, saying in a Twitter message: "Despite reports to the contrary there has not been an arrest in the Marathon attack."
Massachusetts State Police also say no arrest has been made. The U.S. Attorney's Office refused to answer questions about any suspects being questioned or in custody.
"All I can say is there is no one that has been arrested," a spokeswoman for Boston U.S. Attorney Carmen Ortiz.