"This was an incredibly nasty incident and the staff were very shaken but fortunately unharmed, which is our number one priority.
"We will be offering them any assistance and any support they require after this terrible incident.
"We are also working with the police and hopefully witnesses will come forward to help catch these people."
More top news
A mixture of sunny spells and isolated showers this afternoon.
Police think that one of the men involved in last week's abduction attempt at RAF Marham was given a black eye.
A father-of-three from Ipswich had a 'near hiss' when he found a large black snake he feared was a deadly constricter in his back garden.