Linwood police say an investigation into a social media threat against “MRHS” shows no connection to Mainland Regional High School. BreakingAC.com reports posts threatening an act of violence against MRHS was shared numerous times leading to concerns reported by local parents and residents. A thorough investigation by Linwood police with assistance from police in Somers Point and Egg Harbor Township, along with the Atlantic County Prosecutor’s Office found no credible evidence to suggest Mainland Regional is in danger.