Firefighters battled to contain an out-of-control bushfire in Victoria’s west on Sunday before temperatures spike in the region on Boxing Day. The fire in Grampians National park, about three hours west of Melbourne, grew to 34,000 hectares on Sunday after it was ignited by a series of lightning strikes almost a week ago. Residents were warned to leave immediately in Halls Gap, Bellfield, Flat Rock Crossing, Grampians Junction and Fyans Creek. The warning was downgraded to watch and act late on Sunday morning, but it remained unsafe for residents to return. Sign up for Guardian Australia’s breaking news email Emergency