Deadly tornado, storms strike US; roof collapse at Amazon facility, at least 50 'feared dead'

At least 50 people are 'feared dead' after a tornado ripped through the southeastern US state of Kentucky, its governor told reporters, as storms ravaged large swathes of the country, news agency AFP reported.

Tornadoes and severe weather were blamed for several deaths and injuries across parts of the Midwest and the South as a storm system caused significant damage at a candle factory in Kentucky, an Amazon facility in Illinois, a nursing home in Arkansas, and numerous homes and buildings.

Many people were feared dead at the factory in Mayfield, Kentucky, where Gov. Andy Beshear called the situation tragic at a news conference Saturday morning.

There were about 110 people in it at the time that the tornado hit it, Beshear said.

"We believe we'll lose at least dozens of those individuals. It's very hard, really tough, and we're praying for each and every one of those families", he said adding that it was the most severe tornado event in Kentucky.

At least 100 emergency vehicles descended upon the Amazon warehouse near Edwardsville, Illinois, about 25 miles (40 kilometres) east of St. Louis, where a wall that was about the length of a football field collapsed, as did the roof above it.

It wasn't immediately clear how many people were hurt, but one person was flown by helicopter to a hospital.

Edwardsville Police Chief Mike Fillback said several people who were in the building were taken by bus to the police station in nearby Pontoon Beach for evaluation.

By early Saturday, rescue crews were still sorting through the rubble to determine if anyone was trapped inside.

Fillback said the process would last for several more hours. Cranes and backhoes were brought in to help move debris.

"Please be patient with us. Our fire personnel are doing everything they can to reunite everyone with their loved ones", Fillback said on KMOV-TV.

The Belleville News-Democrat reported that the Amazon fulfillment centre in Edwardsville opened with two warehouses in 2016, with 1.5 million square feet of space.

The warehouses are used to store items until they are shipped to mail-order customers.

The safety and well-being of our employees and partners is our top priority right now, Amazon spokesperson Richard Rocha said in a written statement on Friday night.

We're assessing the situation and will share additional information when it's available.

Three storm-related deaths were confirmed in Tennessee, said Dean Flener, spokesman for the Tennessee Emergency Management Agency. Two of the deaths occurred in Lake County, and the third was in Obion County both in the northwestern corner of the state.

A tornado struck the Monette Manor nursing home in Arkansas on Friday night, killing one person and trapping 20 people inside as the building collapsed, Craighead County Judge Marvin Day told The Associated Press.

Five people had serious injuries, and a few others had minor ones, he said. The nursing home has 86 beds.

Day said another nursing home about 20 miles (32 kilometres) away in Truman was badly damaged but no injuries were reported.

The residents were being evacuated because the building is unsafe.

Workers at a National Weather Service office had to take shelter as a tornado passed near their office in Weldon Spring, Missouri, about 30 miles (48 kilometres) west of St. Louis.

One person died and two others were injured in building collapses near the towns of Defiance and New Melle, both just a few miles from the weather service office.

In Kentucky, several buildings collapsed during the severe weather that struck Mayfield, said Sarah Burgess, a trooper with the Kentucky State Police.

She said several people were trapped inside a damaged candle factory and that a shift was ongoing when the storm hit.

The entire building is essentially levelled, she said.

Farther east in Bowling Green, Western Kentucky University said on Twitter that emergency crews were assessing significant storm damage and that no injuries were immediately reported.

However, the school called off commencement ceremonies that were planned for Saturday because the campus was without power.

It's obvious we had major wind damage, said Ronnie Ward, a Bowling Green police spokesman, in a telephone interview.

Rescue efforts in Bowling Green and elsewhere were hampered by debris strewn across roads.

Ward said numerous apartment complexes in Bowling Green had major structural damage, and some factories had collapsed during the storms.

Right now we're focusing on the citizens, trying to get to everybody that needs us, Ward said.

With PTI inputs