Update, 5:01 p.m. ET: ‘The JFK Library incident is reportedly unrelated to the explosions at the Boston Marathon. Reports indicate that it was just a fire, not an explosion. However, police are investigating video footage to see if the fire was caused by a bombing.’ Update, 4:30 p.m. ET: Boston firefighters have found what they believe is an unexploded device after the blasts, a government official said. At least 9 in critical condition. Update, 4:19 p.m. ET: We have a new injury count: According to hospital officials, at least 28 people are being treated for injuries connected to this afternoon’s blasts near the Boston Marathon finish line. More details after the jump…