They were suspected of plotting a terrorist attack in accordance with the aims and ideology of the extremist militia organisation Islamic State.
Champions Bayern Munich are two points short of Union after three successive draws and one behind second-placed Freiburg.
Three late Werder Bremen goals stunned Borussia Dortmund and sealed an incredible 3-2 away win on Saturday as woeful Bayer Leverkusen lost for the third straight game.
The clergyman also abused an 11-year-old girl in Wuppertal in 2011 when she visited him with a friend.
The three are accused of negligence in storing and treating the waste chemicals that exploded.
