cannon ball n.d. tribal leaders protest construction controversial north dakota pipeline vow tuesday fight u.s. president donald trump order revive 3.8 billion project call decision bad move protesters rally months plan route dakota access pipeline lake near stand rock sioux reservation say threaten water resources sacred native american sit tribe fight stop pipeline since last year major victory last month government deny energy transfer partner lp right run pipeline lake oahe water source upstream reservation trump order instruct army army corps engineer review decision republican president also sign order revive billion 6.1 billion keystone xl pipeline project reject 2015 then-president barack obama small airplane circle main protest camp near dakota access pipeline tuesday mood follow white house announcement calm defiant stay benjamin buffalo 45-year-old blackfeet tribal member brown montana tell reporter stand natives future buffalo camp since august tensions start flare law enforcement officer protesters back hollywood celebrities veterans activists tribe recently call protesters leave army corps engineer agree environmental review last month say battle move beyond camp court back room negotiations government tribe also warn camp might contaminate river hit heavy flood march water expect rise tuesday stand rock leaders say would meet come days plan next step say fear fresh violence past clash protesters law enforcement officer dana yellow fat stand rock sioux tribal council member large call trump order poor decision bad move say worry injuries new violence break go see side gear even action grind group people determine stop pipeline one way another tell reuters yellow fat say unsure whether tribe would back away request protesters leave camp say trump order prompt total re-evaluation recent action since exit stand rock sioux camp less organize regular sunrise prayers communal kitchens serve food sporadically spot tent bury snow many 60 cars abandon tribal officials expect cleanup site take month morton county sheriff department urge activists remain peaceful light trump order say brace possible resurgence protest prepare anything might come department spokeswoman maxine herr say continue monitor situation decline say whether additional officer would send protest site morton county spokesman rob keller monday say police plan forcibly remove people campsite protesters number 500 600 nearly 10,000 many camp members native american tribes part country already plan defy stand rock sioux tribe call leave say fight pipeline forest borie 33 magalia california say protest become intense struggle protect planet get intense stake get high say borie camp since early november protesters vow battle trump 's 'poor decision revive pipeline