"Allahu Akbar" Graffiti on Church

Over the weekend in Ybbs (district of Melk) graffiti with messages such as "Allahu Akbar" ("God is great"), "Bomb the Kids," and "Bomb the Church" was found in various areas of the town, including on a church. Police began an investigation and offered a reward for information.
The vandalism occurred some time during the period from October 6th - 8th.