Mercer County - Memorial Day weekend started out "relatively quiet" for police, except for another mysterious "sonic boom."

At 7:29 p.m. Friday, the explosion rocked Shenango Township. A resident in the 3500 block of Hubbard-West Middlesex Road heard "a loud sonic boom," a Mercer County 911 dispatcher said. The caller told the 911 operator "it shook the house; it was not like a transformer blew.

"All of the neighbors came outside to see what happened, so many people felt it."

Southwest Mercer County Regional police were dispatched, but could not find anything.

It was the second such incident reported in as many weeks. On May 13, dozens of callers from Mercer to Sandy Lake to Grove City reported hearing a "massive explosion" at about 9 p.m. Officials have not been able to explain the noise.

The 911 dispatcher said "typical holiday weekend" calls were from all over Mercer County. Early Friday, an alleged "streaker" shocked some callers from Sharon. Later Friday, a reported gas leak near Lake Latonka was cleared up by 11:45 p.m.

At about 5 p.m. Saturday, a kid in a "black hoodie" gave Sharon police a run for their money over "some minor crime."

A couple of hours later, there was a report of a burglary on Tamarack Drive in South Pymatuning Township. About 8 p.m., police in Hermitage responded to a hit-and-run accident with no apparent injuries.