A massive earthquake and aftershocks have struck off the south west coast of the Indonesian island of Sumatra.
The quake measured 8.2 on the Richter scale, which means it was very strong, and caused some buildings along the coast to collapse.
Aftershocks were felt in office blocks about 600km away in the capital Jakarta and at least two people have died.
The quake was centred about 30km under the sea prompting experts to issue a tsunami alert that was later withdrawn.
A tsunami is a series of large waves that can be triggered by earthquakes under the sea bed.
Lots of people living along the coast of Sumatra were told to leave their homes, in case a tsunami struck.
The earthquake is thought to be the strongest to have hit Indonesia since December 2004, when a massive undersea quake sparked a tsunami that killed more than 130,000 people in Banda Aceh.