About 4,000 power customers are without electricity, Mississippi Power says More than a dozen people are injured, including two critically; no deaths are reported Mississippi Gov. Phil Bryant declares a state of emergency for affected counties (CNN) -- At least seven Mississippi counties are trying to recover from a tornado that touched down Sunday, leaving widespread damage and at least 16 injured. So far, no one has been reported killed. But at least two people were critically injured in Lamar County, the Mississippi Emergency Management Agency said. The tornado struck Hattiesburg, the southern Mississippi city that straddles Lamar and Forrest counties. Hattiesburg mayor Johnny DuPree reported major damage to structures around town. The state emergency management agency said seven counties have reported damage. Several homes were destroyed in Marion County, and numerous homes, businesses and public buildings sustained "significant damage." As of Monday morning, about 4,000 power customers are without electricity, Mississippi Power said. That's an improvement from the 13- to 14,000 customers who were without electricity at one point, but it's unclear when power would be restored to everyone, spokesman Mark Davis said. Mississippi Gov. Phil Bryant declared a state of emergency for counties affected. The declaration allows for the use of state resources and assets to support local response efforts, MEMA said. Bryant tweeted photos of the storm damage. Hattiesburg is home to the University of Southern Mississippi. He said between 10 to 15 people were hospitalized, but that none suffered serious injuries. CNN's Maggie Schneider, Chandler Friedman, Elwyn Lopez and Janet DiGiacomo contributed to this report.