Police : Scene is now safe , the police say . Four other people are treated for injuries , police say . A man said he was experimenting with drugs , an officer reads a newspaper . Firefighters put out a fire in a basement room .
NEW : Scene is now safe , Boston police say . Four other people are treated for injuries , police say . A man said he was experimenting with chemicals , an official tells a newspaper . Firefighters put out a fire in a basement apartment .