A blaze near Arthur's Pass has flared up again, almost one week after it first broke out.

Three fire ground crews and a helicopter with a monsoon bucket are battling the scrub fire at Mt Horrible.

Fire Service shift manager Tim Reynolds said crews are dealing with "hotspots" that came up last night.

Reynolds said a section of State Highway 73 is closed will the helicopter is operating.

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The fire first broke out last Sunday, temporarily closing State Highway 73.

Fire crews and five helicopters contained the first blaze on Monday morning.