An estimated 1,100 people have been killed after two massive earthquakes struck Indonesia's West Sumatra province, with the toll expected to rise, said the UN on October 1.

The earthquakes with magnitudes of 7.6 and 7 on the Richter scale occurred on September 30 and October 1.

UN Under-secretary General John Holmes, chief of the Office for the Coordination of Humanitarian Affairs, said at the UN’s headquarters in New York, that teams of relief workers have been deployed to the regions hit by the natural disaster.

The city of Padang , with a population of 900,000, and Pariaman in West Sumatra was worst hit.

The UK has sent a group of 60 rescue experts to Padang, while US President Barack Obama and Syrian President Bashar Al-Assad offered their condolences to victims’ families./.