A second strong earthquake has hit the Indonesian island of Sumatra, a day after an 8.4 magnitude tremor destroyed buildings in several towns and cities.
At least six people are confirmed dead, but officials fear bad communications may be hiding the scale of the impact.
Wednesday's quake was measured by US officials as magnitude 8.4, and a new tremor of 7.7 hit on Thursday.
Many buildings, weakened in the first tremor, are now reported to have been destroyed in the city of Padang.
"Many buildings collapsed after this morning's quake," mayor Fauzi Bahar told a local radio station.
"We're still trying to find out about victims."
Three people are reported trapped in a collapsed three-storey office building, the mayor said.
But despite several warnings since the first earthquake, there have so far been no tsunamis.
The initial quake sparked warnings across the Indian Ocean, but only a small wave surge hit Sumatra, causing little damage.
A new tsunami warning came into force on Thursday morning, after the latest aftershock, but it was withdrawn two hours later.
However, a fresh warning has now been issued, after another magnitude 6.7 aftershock.
At least six people are confirmed dead, but officials fear bad communications may be hiding the scale of the impact.
Wednesday's quake was measured by US officials as magnitude 8.4, and a new tremor of 7.7 hit on Thursday.
Many buildings, weakened in the first tremor, are now reported to have been destroyed in the city of Padang.
"Many buildings collapsed after this morning's quake," mayor Fauzi Bahar told a local radio station.
"We're still trying to find out about victims."
Three people are reported trapped in a collapsed three-storey office building, the mayor said.
But despite several warnings since the first earthquake, there have so far been no tsunamis.
The initial quake sparked warnings across the Indian Ocean, but only a small wave surge hit Sumatra, causing little damage.
A new tsunami warning came into force on Thursday morning, after the latest aftershock, but it was withdrawn two hours later.
However, a fresh warning has now been issued, after another magnitude 6.7 aftershock.
