Belize authorities investigating the slayings of a Virginia cardiologist and his tour guide have detained three men in the case, according to local reports.

The trio of unnamed suspects are not the same trio who were initially brought in for questioning in the June 23 shooting that killed 53-year-old doctor Gary Swank, Belize Live News reported.

“It‘s another set or group of persons that police are investigating at this moment and interviewing at this moment,” Belize Police Superintendent Alejandro Cowo told reporters Monday.

Swank was shot dead along with his tour guide, Mario Graniel, 53, on a fly-fishing expedition in the San Pedro Town lagoon.

Investigators believe the guide was the intended target and the prominent cardiologist was “collateral damage.”

Police have been unable to make an arrest in the case but said they are hopeful that witnesses will come forward.

“Well, you know that we believe that somebody out there saw what happened, regardless if it is in the sea, on land, there’s always somebody that saw what happened and we are getting information and that is what we are following up at this moment,” Cowo said.