A 5.7 magnitude earthquake shook the Salt Lake City area early Wednesday, knocking out power to some homes and bringing the city's light rail system to a halt.
The epicenter was just southwest of Salt Lake City and an estimated 2.76 million likely felt the quake, the U.S. Geological Survey reported.
Most residents felt their homes shake for 10 to 15 seconds.
(The Associated Press contributed to this report.)
