joint action adopt council basi articl treati european union regard cooper law order secur jha council european union regard treati european union articl thereof regard initi kingdom netherland bear mind articl polic cooper regard member state matter common interest previou initi footbal hooligan effort made extend strengthen cooper law order secur detail arrang made cooper regard event broad sens meet attend larg number peopl member state polic primarili aim maintain law order secur prevent crimin offenc meet includ sport event rock concert demonstr road block protest campaign relat matter guard protect peopl properti form part cooper question addit neighbour member state neighbour member state member state transit involv cooper exchang inform group peopl pose threat law order secur member state second liaison offic cooper central bodi part plai cooper joint action intend supplement exist bilater multilater arrang prejudic closer cooper member state adopt joint action articl member state provid member state concern inform request unsolicit central bodi sizeabl group pose threat law order secur travel member state order particip event inform suppli earli stage member state concern neighbour includ member state transit inform includ fullest detail group question composit natur group aggress chanc disturb rout stop point mean transport relev inform reliabl inform inform provid suppli complianc nation law articl member state temporarili post liaison offic member state request liaison offic plai advic assist role power unarm provid inform carri duti accord instruct home member state guidelin member state second host member state ensur liaison offic protect compet author host member state determin activ engag liaison offic liaison offic requir follow guidelin compet author articl order promot cooper member state compet central bodi arrang made spring presid organ meet head central bodi law order secur discuss matter common interest particular central bodi updat spring presid annex central bodi notifi interven interest knowledg organ head central bodi encourag hold exercis exchang train second staff articl joint action publish offici journal enter forc dai public brussel council presid sorgdrag annex central bodi suppli year frequent interv occur particular member state central bodi author ministri address phone number fax number mail address liaison offic name contact languag spoken addit nation languag