Hey, just because the bomb that was set off outside an Upper East Side Starbucks on Monday morning was homemade—"fashioned from a water bottle and the same explosive powder used in fireworks," the Daily News reports—doesn't mean it wasn't a threat to the public. NYPD spokesman Paul Browne said,"Had someone been walking by, this could have caused serious injury, if not death." The police also revealed that a "metal bottle cap inscribed with the capital letters VET that was found amid the bomb remnants"— investigators are looking at whether "there's a manufacturer that makes metal bottle caps that contain those letters"—and that the two teens seen fleeing from the scene that morning are described as blond teen in a red shirt and a brown-haired teen in a gray shirt. John Jay College of Criminal Justice professor Eugene O'Donnell tells WCBS 2, "Bombings are not easy to solve, sometimes because the forensic evidence is so deteriorated."