The FBI cancelled their scheduled press conference that was set to start at 5PM yesterday evening.
The presser was then pushed back a few times, scheduled for 8PM and then finally canceled.
But the FBI did release a statement and it is clear that that are frustrated with the reporting (i.e. CNN) or the lack there of.
Here's the statement from the FBI:
Contrary to widespread reporting, no arrest has been made in connection with the Boston Marathon attack. Over the past day and a half, there have been a number of press reports based on information from unofficial sources that has been inaccurate. Since these stories often have unintended consequences, we ask the media, particularly at this early stage of the investigation, to exercise caution and attempt to verify information through appropriate official channels before reporting.