Fri Dec 14 midnight Crews were dispatched to a reported house fire in the 500 blk. of N. Jackson Ave. E-01,E-03 A-01 and C-02. C-02 1st in and found 1 story structure heavy smoke and fire visible, reported occupants trapped. Battalion chief made several initial attempts to search/rescue with no success. E-01 and E-03 10-23 at same time and made several attempts E-04 and E-11 were 2nd alarm. 2 children deceased and another critically burned. Bystanderds attempted rescue before FD arrival. Crews did there best and had a tough and long night. Cause is still Undetermined.