COLUMBIA, S.C. (AP) — A sheriff said his deputies are methodically investigating a weekend mass shooting that killed four people and injured 16 more at a bar on a South Carolina island but haven’t gotten the kind of help they need from the hundreds of people partying before the shooting.

No arrests have been made yet as investigators test DNA, analyze weapons and bullets, and enhance video from the crime scene of the early Sunday shooting at Willie’s Bar and Grill on St. Helena Island, Beaufort County Sheriff P.J. Tanner said Wednesday.

Investigators think the shooting started as a dispute between two or three people who grew up together in Beaufort County and started firing at each other.

“We had 700 people at this party. And we have yet to get a witness that can tell us who the shoote

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