From the District Council website :
Haltern Am See
As a mark of respect, in relation to the sad loss of 16 children and two teachers from the Joseph-Konig-Gymnasium in our twin town of Haltern am See, the Council has lowered flags to half-mast and will remain so, until further notice. The Chairman of the Council, Councillor Mrs June Lumley, has written to the Burgermeister of Haltern am See, Burgermeister Bodo Kimpel, expressing condolences on behalf of the District