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.