ALBANY, N.Y. (AP) — A coalition of environmental groups on Tuesday called on state officials to release details of a health impact study for shale gas drilling and a procedure that involves blasting chemical-laden water deep into the ground.

Representatives of a dozen prominent organizations signed a letter to Health Commissioner Nirav Shah and Environmental Conservation Commissioner Joseph Martens. They asked them to make public the health impact study being evaluated by a scientific panel, and they called for public hearings and a 60-day public comment period on the health study.