BOSTON (AP) — An explosion that occurred early Saturday morning at Harvard Medical School has raised concerns among authorities, who have determined the incident was intentional but thankfully resulted in no injuries. A university police officer who responded to a fire alarm attempted to apprehend two unidentified individuals who fled from the Goldenson Building just before the explosion was reported. Following a thorough investigation, the Boston Fire Department confirmed that the explosion was deliberately set, although police have not found any additional explosive devices during their subsequent sweep of the building. In response to the incident, police have released grainy surveillance images of the two suspects, who were seen wearing face coverings and hooded sweatshirts.}