Fernando J. Herrera-Rivera, age 23, of Gaithersburg, has pled guilty to four counts of 2nd degree arson in connection with a spree of fires that occurred early morning on Sunday, September 17 in Gaithersburg. Herrea-Rivera was arrested in the area of N. Frederick Ave that same morning after police used video surveillance footage and witness accounts to identify him. Herrera-Rivera was also wanted on a bench warrant for an unrelated charge.