Here are a few ways to rewrite the title in Swedish, with the most natural and news-style option first:
Option 1 (Most natural, using a dash):
Explosion på Kråks skjutbana i Karlsborg – polisen utreder arbetsplatsolycka
Option 2 (Using a colon):
Explosion på Kråks skjutbana i Karlsborg: Polisen utreder arbetsplatsolycka
Option 3 (Closest to the original structure):
Explosion vid Kråks skjutbana i Karlsborg, polisen utreder arbetsplatsolycka
Note: ”På” is more commonly used than ”vid” when referring to a specific location like a shooting range, and Swedish news headlines typically use a dash ( – ) to separate the two parts for clarity.