The explosion happened around 8:40 p.m. Friday at the facility located at the intersection of Charter Oak Drive and Coleman Road. Dippin' Dots Vice President of Administration and Human Resources Steve Heisner said four employees were injured and taken to a hospital. Heisner later updated Local 6 that of the four, one was discharged and another will be discharged soon. Heisner said he could not release the types of injuries the employees suffered. Heisner hopes a structural engineer can come to the facility on Saturday to assess the building. Only after that happens can cleanup efforts begin. The explosion happened near the production area of the facility, Heisner said. But the cause is unclear. Firefighters were on scene for several hours Friday night to go through the facility.