Reporters have gathered at the Sheraton Hotel in downtown Boston  for an expected 5 p.m. ET press conference about the Joint Terrorism Task Force investigation into Monday’s bombings that killed three and injured more than 170 people at the Boston Marathon.

Contradictory media accounts about the search for suspects in the case drew a reprimand from the FBI and have generated recriminations in the press corps.  Jake Tapper of CNN has clarified what he called “some confusion and misreporting” about alleged suspects in the case.  A 17-year-old high-school student who was misidentified as a suspect tells ABC News he was shocked to see his photo displayed in media accounts.

UPDATE: Reporters say they expect the FBI to release to news organizations surveillance video used to identify potential suspects in the bombings.

UPDATE II: FBI Special Agent in Charge Richard Deslausiers displayed photos of two men — one in a white cap and one in a dark cap — who are described as suspects in the case. Deslauriers announced that the photos and videos of these suspects are available at the FBI Web site, which immediately crashed under the heavy traffic.

UPDATE III: Photo of Suspect 1 and Suspect 2 together:

UPDATE IV: Video from CBS News:

UPDATE V: The FBI has uploaded 11 photos of the suspects here.

UPDATE VI: Larger format YouTube video from the FBI:

UPDATE VII: The FBI is soliciting public assistance in their investigation:

To Provide Tips in the Investigation
If you have visual images, video, and/or details regarding the explosions along the Boston Marathon route and elsewhere, submit them on https://bostonmarathontips.fbi.gov/. No piece of information or detail is too small.
You can also call 1-800-CALL-FBI (1-800-225-5324), prompt #3, with information.

UPDATE VIII: Matt Stout of the Boston Herald reports:

The FBI has released images of two suspects in the Boston Marathon bombings and is asking for the public’s help in identifying them.
“Today we are enlisting the public’s help to identify the two suspects,” said Richard DesLauriers, FBI special agent in charge in Boston at a packed press briefing this afternoon at the Sheraton Hotel in Boston. “Someone out there knows these individuals.” …
Officials believe the men to be “armed and extremely dangerous,” said DesLauriers, adding that people should contact authorities if they have any information, no matter how small or unimportant it may seem.
“Do not take any action on your own,” he said.

ViralRead has posted a gallery of the FBI photos of the Boston Marathon Bombing Suspects.