Singapore's Meteorological Services Division said an earthquake measuring 6.6 on the Richter scale struck Padang, Indonesia at about 11.50am.
A second round of tremors was felt in Singapore at around 1.50pm.
The epicentre of the quake was 50 kilometres north-northeast of Padang, on the island of Sumatra in Indonesia and some 430 kilometres south-west of Singapore.
The US Geological Survey said the quake measured 6.3 on the Richter scale, while Indonesian seismologists estimated a lower magnitude of 5.8.
Tremors were felt in many parts of Singapore. Some buildings, like the Concourse at Beach Road, Capital Square and Centennial Tower in the city,
and even Ngee Ann Polytechnic in Clementi, were evacuated.Picture above taken at samsung hub when everyone was running for their life including myself..lolzWe rested at the coffee shop opposite then went at about 3pm..:p