A new earthquake has rocked the city of Oklahoma City, killing at least two people and shaking buildings to their foundations.
The quake was felt across the city, with many people unsure where they were and worried that they were too close to the epicentre.
The epicentres were at 4.6 and 4.7 magnitude, the US Geological Survey (USGS) said.
The area where the quake hit was in a valley that runs along the city’s east side.
The USGS says it is now located about 200km north-west of the epicenter of the quake, which is located in a region of high pressure and an atmosphere of warm air.
“We’re still not sure what caused this,” USGS seismologist Mark Sussman told AFP news agency.
Oklahoma City Mayor Mick Cornett described the epic event as a “tragic, tragic day”.
“It was an incredibly powerful earthquake,” he told the Oklahoma City Star newspaper.
“I am so saddened by this.
I don’t know how it happened, but I feel very terrible.”
A large fire was also reported near the epicend of the earthquake.
Mary Fallin said at least nine people have been killed and more than 150 were injured.
The official death toll is expected to rise, she said.
Some people were trapped under their homes and in their vehicles after the earthquake struck.
A number of buildings were damaged, with at least one reported building falling onto the street.
The Oklahoma City Fire Department said at about 11:00pm local time that the building had collapsed and was in need of repairs.
Some streets in the area were blocked off and were heavily damaged.
A man who identified himself as an employee of the building was evacuated from the building, while others were forced to leave because of high winds and heavy rains.
The mayor also tweeted that at least five people had been confirmed dead.
The building is owned by the local bank, which was placed on lockdown after the quake.
The governor has said that he will hold a press conference on the incident on Wednesday.
The latest quake comes on the same day that a magnitude 7.1 quake struck the country’s capital, Washington, killing seven people and damaging more than 1,200 buildings.