At least 2 injured in explosion at train station in southern German city of Augsburg, making it third suspected incident in country in two days

In first incident, power infrastructure near Janschwalde power plant in Brandenburg was targeted in sabotage attack Tuesday

Brandenburg Interior Minister Jan Redmann said suspects used projectile devices to cause short circuits in extra high voltage line

Electric substation near Cologne was also targeted in sabotage attack earlier Wednesday

Cause of incident in Rhein Erft remains unclear as investigation continues