the fbi and nypd said on wednesday that a reward of up to $ 115,000 is being offered for information leading to an arrest and conviction in the march 2008 .
no one was injured .
but police commissioner william bratton says people had walked past just moments before the device detonated in the early hours of march 6 .
officials said the explosion may be connected to earlier unsolved bombings at the british and mexican consulates .