baghdad islamic state militants set fire three oil well near hawija west oil city kirkuk one two areas iraq still control military oil officials say monday iraqi security force use bulldozers control fire start militants early hours saturday slow advance u.s.-backed iraqi force shi ite militia group toward hawija town military officials say allas oilfield 35 km 20 miles south hawija one main source revenue islamic state 2014 declare caliphate part syria iraq terrorists try use rise smoke avert air strike retreat area toward hawija say army colonel mohammed al-jabouri military officials say fire bring control one well two still burn say would take three days put fire oil officials state-run north oil company say still risky send crew assess damage well militants may leave bomb landmines iraq launch offensive sept. 21 dislodge islamic state hawija islamic state ultra-hardline sunni muslim group lose control oilfields control north iraq islamic state torch oil well northern iraq officials