"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
Magazine about alpacas and goats up against national glossies for top award
Cloudy and breezy with some patchy rain at times but also with some decent drier spells also likely. Feeling warm in any brighter spells.
An ITV News camera captured an 'agitated' Clive Lewis moments after he was told his speech at the Labour conference had been 'watered down'.