Watch: Indonesia's Mount Soputan erupts on quake-hit island

A volcano erupted on Sulawesi on Wednesday, days after an earthquake and tsunami on the Indonesian island killed more than 1,400 people.

Mount Soputan, which is about 600 kilometres northwest of Palu, spewed volcanic ash more than four kilometres into the sky according to a tweet by Indonesia's disaster mitigation agency spokesman, Sutopo Purwo Nugroho.

There were no reports of any casualties or damage. The eruption was also not expected to disrupt flights.

However, authorities told residents within a four-kilometre radius of the volcano to standby for evacuation orders while nearby communities have also been told to be prepared for volcanic ash fall.

More than 2,500 people were heavily injured in the 7.5 magnitude quake and deadly tsunami waves, the agency said.

Some remote areas have been largely cut off after quake triggered tsunami waves, destroying roads and bridges, and their losses have yet to be determined.

(With inputs from Reuters)