Two bodies pulled from water ; two others presumed dead . Investigators are trying to establish the facts of the crash but wo n't determine the probable cause for some time , Hersman said . Search stopped Sunday evening because of weather , will resume Monday . Police investigating Saturday 's collision of helicopter , plane over Mississippi River . Pilot on scene says he tried to warn helicopter before accident .
Two bodies pulled from water ; two others presumed dead . Search stopped Sunday evening because of weather , will resume Monday . Police investigating Saturday 's collision of helicopter , plane over Mississippi River . Pilot on scene says he tried to warn helicopter before accident .