That is what has been claimed, but if we haven't seen the statement then how do we know it is being quoted accurately.
This is from the Campaign Website:
http://www.jeremy-bamber.co.uk/alibis-1
Statement of PC Brown (after 7am)
He also details what he believed to be a gun in the window of the small room off the master bedroom, supporting the evidence of WPC Jeapes. How could sightings by two firearms officers, who were located separately and both watching the house using the telescopic sight of a firearm be mistaken about seeing the gun in the window?