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New York City police officials released a surveillance video this afternoon, that partially captures the pre-dawn explosion in Times Square that targeted the famous U.S military recruiting station.

No one was hurt and the damage to the facility was minor, but officials said the crude device could have" injured or even killed" someone.

The video shows a bicyclists that matches the description provided by a witness who says he saw a suspicious man on a bike approach the recruiting station just before a small blast blew out the glass at the front of the building.

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Blast in Times Square

The recruiting office is not seen in the video, which the NYPD says was captured by a private security camera. But the video ,which is pointing just north of the building, shows a flash of light and a large cloud of smoke drift into the frame after the explosion.

Mayor Michael Bloomberg vowed today to track down and prosecute those responsible. "We will not tolerate such attacks," he said, adding that the apparent targeting of the famous recruiting station is "an insult to every one of our brave men and women serving around the world."

The device exploded around 3:45 a.m. No one was insidethe recruiting center at the time.

New York City Police Commissioner Ray Kelly, who joined Bloomberg at a news conference this morning, said that the bomb was a "low-order explosive" made with powder placed in a green ammunition box. "It was not a particularly sophisticated device" he said.

This afternoon, Kelly said it's not clear if the grainy, poor quality video can be enhanced, but added they were still checking other video cameras in the area and hoped to find a better images.

No other eyewitnesses to the explosion have emerged, despite the fact that the recruiting station is directly across the street from a police sub-station and right in the middle of the famed "crossroads of the world."

The lone officer in the station heard the explosion and ran outside, Kelly said, but saw nothing. He did encounter a man who said he saw a man on a bicycle wearing a hoodie, dark clothing and a backpack acting suspiciously near the installation around the time of the blast. But Kelly said this witness did not see anyone actually place the device or see the explosion.

Both the mayor and police commissioner stressed that they had no evidence of any outside terrorist connection. There is "no evidence of any connection to anyone else" Bloomberg said.

The FBI is investigating the incident, along with the Joint Terrorism Task Force, which is made up primarily of FBI and New York Police Department officials. Any prosecution would likely draw federal charges since a military installation was targeted.

Tourists staying at a Marriott hotel four blocks away told the Associated Press they heard, and felt, the blast.

"I was up on the 44th floor and I could feel it. It was a big bang," Darla Peck, 25, of Portland, Ore., told the AP.

"It shook the building. I thought it could have been thunder, but I looked down and there was a massive plume of smoke so I knew it was an explosion," said Terry Leighton, 48, of London, who was staying on the 21st floor of the Marriot.

Bloomberg, talking to reporters in a hectic Times Square, assured tourists and residents this morning that the city was safe.

"New York City is open for business," he said.

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NYC Officials Comment on Explosion

Early in the investigation, subway cars passed through the Times Square station without stopping, but normal service was restored, with some delays, before the morning rush hour began.

The recruiting station, located on a traffic island surrounded by Broadway theaters and chain restaurants, has occasionally been the site of anti-war demonstrations, ranging from silent vigils to loud rallies.

"If it is something that's directed toward American troops that's something that's taken very seriously and is pretty unfortunate," Army Capt. Charlie Jaquillard, commander of Army recruiting in Manhattan, told the AP, echoing the mayor's sentiment.

Although officals said they had no evidence to connect today's incident to earlier, similar incidents, the attack on the recruiting station did bear strong similarities to two past explosions where small homemade bombs or incendiary devices were tossed at official buildings in New York City. Two were tossed at the British consulate in 2005 and, more recently, two were tossed at the Mexican consulate last October.

In each case, a man on a bike was captured in hazy video images. Police found no second device this time.

Over the years, many protests have targeted the recruiting center.

In October 2005 a group of activists who call themselves the Granny Peace Brigade rallied there against the Iraq War. Eighteen activists, most of them grandmothers — with several in their 80s and 90s — were arrested but later acquitted of disorderly conduct.