Update: 4pm Emergency services have declared the fire under control.
3.10pm EIGHTEEN vehicles are responding to an out of control grassfire on Lancaster-Mooroopna Rd, Undera.
At about 2.45pm fire crews responded to reports of a grassfire which had broken out and burned along the roadside.
Police were on the scene to divert traffic.
It is unknown what caused the fire.
More to come.