The explosion early Monday destroyed a sidewalk bench and shattered windows; no one was injured. The coffee shop, near the Guggenheim museum, was open Tuesday morning, although the windows hadn't been fixed. Traffic was back to normal in the area.
Starbucks said in a statement Tuesday that customer and employee safety is its top priority but that it can't discuss specifics during the investigation.
Investigators were analyzing shards of white plastic found at the scene to determine how the explosive device was made. No suspects have been identified.
It was unclear whether the blast was related to other explosions around the city in the past four years: at the British consulate in May 2005, the Mexican consulate in October 2007 and the Times Square military recruiting station in March 2008.
So far, the only similarity has been the time: All the blasts occurred between 3:30 a.m. and 4:30 a.m. In the previous bombings, a bicyclist was seen in the area before the explosions. No one of interest has been identified in the surveillance footage viewed by investigators, police said Tuesday.
Police also were looking at whether the Starbucks was the target.
The Starbucks Corp., based in Seattle, is the world's largest gourmet coffee retailer, with more than 15,000 stores, according to a 2008 profile on its Web site. It said Tuesday it didn't believe its store was hit intentionally.
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