Here's one that has some distinct similarities:
http://cityroom.blogs.nytimes.com/2008/03/06/police-investigate-explosion-in-times-square/March 6, 2008, 5:33 am
Blast Damages Times Square Recruiting Station
New York City police officers and firefighters cordoned off much of Times Square for more than two hours after a small explosion — set off, the authorities said, by an “improvised explosive device” — damaged the front of the Armed Forces Career Center on the traffic island bounded by 43rd and 44th Streets, Seventh Avenue and Broadway at 3:43 a.m., officials said. No one was injured, and after a temporary interruption, subway service was restored. . . .
The police said the explosive device involved in the Times Square blast this morning was “roughly similar” to the devices used in two earlier bombings at foreign consulates in Manhattan, in 2005 and 2007, Police Commissioner Raymond W. Kelly said at an afternoon news conference. The device had been placed in an ammunition box like the kind that can be bought at a military supply store. Officials said that in today’s attack, a man bundled in a gray hooded jacket or sweatshirt and wearing a backpack was seen riding a bicycle around the recruiting station and acting suspiciously moments before the explosion. Video footage from a surveillance camera showed a bicyclist dismounting, approaching the recruitment center, then returning to the bike and riding away before the explosion occurs.
On edit -- here are those earlier consulate incidents:
http://www.nytimes.com/2005/05/05/nyregion/05cnd-blast.htmlMay 5, 2005
Two small explosions went off in a large cement planter outside a building housing the British Consulate on Third Avenue in Midtown Manhattan early today, causing some property damage but no injuries. . . .
The blasts, which occurred as voters went to the polls in Britain in a general election, shattered the glass in the front door of the building. The consulate is on the 9th and 10th floors of the buildings, which also houses other foreign-based offices.
Police Commissioner Raymond W. Kelley said at a news conference that the devices that caused the explosions were believed to be World War II "novelty grenades" of the type that someone might keep on their desks. He said they had been packed with black powder.
http://www.nytimes.com/2007/10/27/nyregion/27consulate.htmlOctober 27, 2007
Two dummy hand grenades that had been fashioned into crude bombs exploded outside the Mexican Consulate in Manhattan about 3:40 a.m. yesterday, the authorities said. The attack bore a striking similarity to a blast two years ago outside an office building housing the British Consulate. . . .
Law enforcement officials were investigating whether the attacks on the two consulates were the work of the same person, but stopped short of definitively linking them. Nevertheless, they said the improvised explosive devices used in both cases were virtually identical. . . .
In the 2005 explosion, surveillance videotape, along with other evidence, indicated that someone riding a bicycle had hurled a device at the building. The arc of the device — with its lighted fuse — can be seen on the videotape.
In yesterday’s attack, a witness reported seeing a man in his 20s on a bicycle pedaling quickly away and turning south onto Park Avenue, the police said. The bicyclist was wearing a hooded gray jacket and his face was partly covered, but the police could not say for certain that he threw the grenades.