Ember ManyArray `deleteRecord()` and `save()` does not send DELETE request

I'm trying to delete some records from a ManyArray with removeRecord().. The records are removed but when calling save() on the ManyArray there is no DELETE request for the deleted records..

actions: {
  removeEmployee: function(employee) {
    var employees = this.get("employees"); // ManyArray
    employees.removeRecord( employee );
  },
  saveEmployees: function() {
    var employees = this.get("employees"); // ManyArray
    employees.save().then( function(employees) {
      Ember.Logger.log("Success",employees);
    } ).catch( function(error) {
      Ember.Logger.log("Failed",error);
    } );
  }
}