(CNN) -- Authorities including bomb experts searched an apartment in Revere, Massachusetts, and removed items, after two deadly bombs struck the Boston Marathon. But officials cautioned that there are currently no clear suspects -- and the motive remains unknown.
Officials also announced a twist in the probe: Suspicious packages that were detonated out of precaution were not explosive devices after all.
After the blasts Monday, some officials reported that explosive devices that failed to go off were found. U.S. Rep. Bill Keating of Massachusetts, who serves on the Homeland Security committee, said there were two.
But Massachusetts Gov. Deval Patrick announced Tuesday that there were only two bombs -- the two that exploded at the marathon, killing three people and wounding 154.
