NEW YORK (MarketWatch) -- No arrest has been made in the Boston Marathon bombings, the Boston police department said on its Twitter account Wednesday. The statement contradicts an earlier report from CNN, which said an arrest had been made, citing a source. CNN has updated its report, saying two senior administration officials and another federal official have since said there had been a misunderstanding among officials and that no one has been arrested. Earlier, the Boston Globe said authorities have an image of a suspect carrying, and perhaps dropping, a black bag at the second bombing scene on Boylston Street, outside of the Forum restaurant. Authorities planned to brief the media on the progress of the investigation at 5 p.m. Eastern, it added.