"We have also recovered a firearm," Glossop said.
"There were four staff members in the dairy at the time as well as members of the public, including children.
"Thankfully no one was injured. The victims are obviously shaken by what has occurred and are being supported by victim support and police."
Glossop said the police officer who was immediately following the vehicle and was allegedly fired upon is being supported by his colleagues.
"This was a very serious incident and we are relieved that no one was injured."
Police inquiries into the matter are continuing and further information on charges will be provided as it becomes available, Glossop said.