JAKARTA, Indonesia (CNN) -- A series of earthquakes, ranging in magnitude from 6.7 to 4.7, struck off the western coast of Indonesia's Sumatra Island on Sunday, the U.S. Geological Survey said.
At least seven people were injured and one building collapsed in Padang City in West Sumatra, according to Rustam Pakaya, head of the social affairs ministry's disaster response division.
Another official, Sudirman Gani, said those hurt suffered minor injuries from falling debris and were admitted to a local hospital.
"People were (in) panic, but now, they are going back to their own houses," said Gani, head of National Unity Affairs for West Sumatra. "We have coordinated with the local disaster agency to anticipate another quake within the next 24 hours."
Officials continued to search for reports of casualties.
No tsunami warning was immediately issued.
The quakes were recorded in the Kepulauan Mentawai region, a chain of islands popular with surfers.
CNN's Andy Saputra and Erin Mclaughlin contributed to this report.
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