An early morning fire at a dairy farm in the 2600 block of Confederation Line has caused significant damage.

Sarnia Fire Rescue Services were called to the scene around 1 a.m. on Wednesday after a neighbour reported seeing flames coming from a large barn.

Crews arrived to find the barn was fully involved and the fire was beginning to impact feed stock nearby.

Sarnia fire says crews worked to contain the blaze and were still on scene late Wednesday morning dealing with large hay and straw bales.

No livestock was injured in the fire and damage is estimated at about $2 million.

Officials say the Ontario Fire Marshal's Office is being notified.