There has been fear that decades of enmity between the two could spill over into all-out war
The tornadoes caused "catastrophic" damage, according to US media, and prompted the National Weather Service to issue its highest level of tornado alert.
Governor Tate Reeves tweeted that he had declared a state of emergency "to protect the health and safety of Mississippians in response to the severe tornadoes and storms hitting across the state."
"We are mobilizing all resources available to protect our people and their property," Reeves said, telling residents "you are not alone."
The Mississippi Emergency Management Agency reported that all six deaths occurred in the southern part of the state.
"These are initial reports and will continue to update when info becomes available," the agency tweeted.
The Storm Prediction Center said it expected "severe thunderstorms" to continue through the night in Mississippi, as well as in the neighboring states of Alabama and Georgia.
"Strong tornadoes, widespread damaging winds, and large hail are all possible," the center added.
Earlier on Sunday, Reeves urged residents to take the "severe storms very seriously."
"Please take precautions to keep your family safe."
He later retweeted a message from the state disaster agency reminding people to cover their noses and mouths and practice social distancing to prevent the spread of coronavirus if they had to go to public storm shelters.
There has been fear that decades of enmity between the two could spill over into all-out war
The leading hypermarket chain has implemented additional measures to ensure sufficient stock availability for shoppers
Thousands of personnel deployed to clear accumulated water, clogged drains, and fallen trees
Areas such as Abu Shagara, Al Qasimiya, King Faisal Road, Al Mahatta, and Majaz have been particularly affected
The Ministry of Foreign Affairs reiterated its call on the United Nations and the UN Security Council to fulfill their responsibilities
This step aims bring relief to thousands of residents in Emaar’s communities who have been badly affected by unprecedented rains
Dressed in all black, the man was seen directing traffic for nearly six hours
Four others to drive away a luxury vehicle each