berlin 1,500 police duty berlin sunday germany capital face logistical challenge organise election expect draw large turnout ensure annual marathon also run smoothly police election officials race organisers close consultations security arrangements especially follow deadly truck rampage berlin christmas market last december well attack boston marathon 2013. officials berlin police bka federal criminal police office say indications specific plot attack either race city 1,779 poll station berlin state election office say letter send around 44,000 city 2.5 million eligible voters warn 30 station might difficult reach marathon marathon expect end early afternoon poll close p.m. local time voter participation expect exceed 72.5 percent 2013 largely due referendum fate berlin tegel airport serve city cold war voter participation already relatively high 2013 think even high year high interest tegel referendum spokesman say vote plus marathon spell super-busy sunday berlin police