Damage to barrier at Black Marsh Wood

This photo is of the damage to a barrier in Black Marsh Wood, Hemford. Does anyone know how this happened or who might have done it? This is a sensitive area for wildlife and the barriers and signs are frequently damaged. The Forestry Commission barrier and signage are there because this is NOT a byway open to all traffic. It has a prohibition on it.
Contact the police and Forestry Commission or myself
if you can.