NEW YORK - A low-level explosion outside a Starbucks coffee shop sent frightened people running into the street early Monday. The explosion blew out the windows of the restaurant, according to New York City Police Commissioner Ray Kelly. A "low-order improvised explosive device" exploded after being left on a wooden bench in front of the coffeehouse, Kelly said. The blast could be heard many blocks away. Several people were briefly evacuated from the building above the Starbucks, Kelly said, but no one was injured. The interior of the Starbucks sustained no damage. It's too early to tell whether Monday's incident is connected to other minor explosions in New York City in recent years, including ones at the British and Mexican consulates and another in Times Square, Kelly said.