coffee shop . `` We have a witness who believes he saw two young people he describes as teenagers , both white males , '' the commissioner said . One is described as blond , wearing a red shirt , and the other had brown hair and wore a gray shirt . Kelly said the witness saw the two approach the Starbucks , then looked away . After the witness heard the blast , he said he saw the two young people run away from the building . Kelly said that for now , it 's impossible to say whether the bombing was politically motivated . `` We do n't know if they were a corporate target or somebody had a problem -LSB- with -RSB- what was going on on that corner , in general ... we 're not ruling anything out . '' In 1999 , a Starbucks in Seattle , Washington , was vandalized during a world trade conference . In February 2008 , a Vancouver Starbucks and another restaurant were damaged by an overnight explosion . New York police say they 're aware of both incidents , but Kelly says it is too early to draw any
NEW YORK -LRB- CNN -RRB- -- A crude bomb made from a water bottle was used in an explosion that damaged a Starbucks coffee shop on New York 's posh Upper East Side , New York police said . Monday 's explosion shattered glass at the Manhattan Starbucks coffee shop . No one was injured . The Memorial Day explosion damaged the shop , but no one was injured and no motive has been identified for the bombing . `` We believe it to be ... a six - to 10-ounce water bottle that was wrapped in black tape , '' New York Police Commissioner Ray Kelly told CNN on Wednesday . He said the bomb 's powder may have come from fireworks components , including a fuse . The powder was placed inside the bottle in a way that made it `` more powerful , '' Kelly said . He said a forensics unit is working on finding fingerprints . The homemade bomb , which went off around 3:30 a.m. , shattered glass , but no one was injured . The store was not open . Police have said the device was planted under a wooden bench outside the