Arsonists have targeted a Port Noarlunga barber shop just days after reopening following a shutdown.

Police say that an accelerant was used to fuel the blaze, which started just after 4am this morning.

Fire crews responded at around 4:30am and were able to contain the blaze from doing extensive damage to neighbouring Gawler Street businesses.

The barbershop closed its doors temporarily on June 15 before reopening three days ago.

No one was injured in the incident.

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Anybody with any information is being urged to contact Crime Stoppers on 1800 333 000 or at crimestopperssa.com.au