declar execut committe februari abduct minor sch decl rev execut committe abduct minor unlaw remov minor parent person custodi attribut matter real concern contract parti convent implement schengen agreement take account articl abovement convent declar purpos schengen inform system maintain public polici public secur appli provis convent relat movement person state concern decid accord nation provis alert enter schengen inform system abductor parent unlawfulli remov minor person award legal custodi includ inform alert minor pursuant articl convent uniform solut found minor abduct unlawfulli remov parent person award legal custodi locat return person quickli recommend minor unlawfulli remov parent parti care person award custodi advis event enter alert minor pursuant articl alert accompani form siren bureaux full detail circumst surround disappear inform identif abductor person institut legal accord educ custodi event inform reason appertain nation procedur provid point event hit forward siren bureau state obtain hit author enter alert schengen inform system follow procedur send relev siren bureau inform diffus form equal imper author respons border control extern border systemat check ident paper travel document minor import minor travel compani adult document check control similar procedur territori