A strong 6.4-magnitude quake hit the Sumatra city of Indonesia on Saturday, days after a tremor on the vast island killed dozens and left thousands homeless.

A strong 6.4-magnitude quake hit the Sumatra city of Indonesia on Saturday, just days after a tremor on the vast island killed dozens and left thousands homeless, according to US seismologists.

No tsunami warnings were issued, and reports did not record damage.

"Reports did not indicate damage after the quake struck at a shallow depth of just 23 kilometers (14 miles) off the southwest coast of the vast island," said  the US Geological Survey.

Tuesday's tremor left 35 people killed and around 16,000 homeless,  according to the national disaster agency.

In 2004, a quake-triggered tsunami killed more than 170,000 people in Aceh, as well as tens of thousands more in countries around the Indian Ocean.

Indonesia lies on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent seismic and volcanic activity.