Affidavit: Ongoing investigation in Darlington County led to âexplosive materialâ arrest in Myrtle Beach Affidavit: Ongoing investigation in Darlington County led to âexplosive materialâ arrest in Myrtle Beach By WMBF News Staff | April 5, 2021 at 7:52 PM EDT - Updated April 5 at 11:19 PM MYRTLE BEACH, S.C. (WMBF) â Court documents provide new information on what authorities found inside a Myrtle Beach apartment complex that led to an âexplosive materialâ arrest. According to an affidavit, the Myrtle Beach Police Department and the South Carolina Law Enforcement Division were called last Wednesday to 830 44th Avenue North in connection to an ongoing investigation in Darlington County.