vatican city perhaps matter time rome hit barcelona-style attack security force ready case vatican target head swiss guard say security step religious sit throughout italy include vatican since last year truck drive suspect islamist militant kill 86 people french city nice barriers police army vehicles place around st. peter basilica make hard vehicle gather speed attack one last week barcelona kill 13 people despite threats islamic state rome italian cities far spar kind vehicle attack also hit nice london berlin could perhaps matter time attack rome prepare christoph graf commandant swiss guard quote tell swiss catholic website cath.ch graf refer attack barcelona speak sideline religious ceremony swiss city solothurn early week websites link islamic state militants make threats catholic target rome recent years 2015 video show behead 21 egyptian coptic christians libya one killers say safety crusaders something wish ... conquer rome allah time website use militants run photo montage show movement black flag fly obelisk center st peter square swiss guard origins papal protection force 16th century number 110 men swiss nationality share responsibility protection pope vatican police force size italian police responsible patrol vatican external perimeter rome vatican security force train anti-terrorism tactics use modern weapons vatican prepare case barcelona-style attack swiss guard chief