One of the strongest tornadoes ever recorded has ripped through a suburb of Oklahoma City, killing as many as 91 people and destroying everything in its path.

At least 91 casualties, including children, were reported after a record-breaking tornado swept through the Oklahoma City suburb of Moore, destroying hundreds of buildings and two schools. Meteorologists reported winds of up to 200mph.

A large tornado touched down on Monday in Moore, Oklahoma, a suburb of Oklahoma City, causing catastrophic damage to several housing developments and at least two schools in the area. A local television news helicopter tracked the tornado as it moved through the area, and then began to survey the extensive destruction to the region.

The Oklahoma Medical Examiner’s Office has confirmed a total of 91 fatalities so far as a result of today’s tornadoes, 40 of whom are reportedly children. Over 233 injured, including around 70 children, have been reported, with many of the victims being treated at two local hospitals.

Monday’s storm appeared to be the deadliest tornado since 2011, and one of the worst in the last 20 years according to the Atlantic. The town lies in the center of ‘Tornado Alley,’ an area west of the Mississippi River stretching from north Texas to South Dakota, known for its frequent and powerful tornado systems.

Several children were pulled alive from the wreckage of Plaza Towers Elementary School after the devastating tornado – between one and two miles wide – reduced the building to heaps of rubble and twisted metal.

Rescuers passed the children down a “human chain” to get them to medical personnel for treatment.

Roughly 500 students attend the school. It is unclear whether any had been evacuated before the twister hit, but local media reported some children were taken to a nearby church.

Firefighters were at the scene digging through the debris to reach any pupils possibly trapped inside.

Fourth, fifth and sixth graders were evacuated to a church, but younger students sheltered in place, KFOR reported. Seven students at Plaza Towers Elementary School were found drowned at the bottom of the wreckage Monday evening. Several other students and school staffers were pulled out alive from the debris during the day, with officials reporting that teachers had shielded students with their own bodies.

A first-year teacher at the school told a group of children to shelter in a restroom as the building was rocked by the force of the tornado, KFOR reported. All of them survived the ordeal, and were guided away from the devastated school by rescuers.

Rescue teams continued to sift through the destroyed structure on Monday evening, but no additional survivors were expected, according to local media at the scene.

Students at another local school, Briarwood Elementary, had been accounted for and moved to a safe location.

Officials at two hospitals said they were treating more than 140 patients, including around 70 children. Dozens of people were said to be in a critical condition.

President Barack Obama spoke to Oklahoma Governor Mary Fallin on the phone and promised the state all the help it needs as he declared the devastating tornado a major disaster.

Ms Fallin told a news conference “hearts are broken” for the parents looking for their children.

“This is a very sad day for the state of Oklahoma – a very hard day and very tragic day,” she said.

“Our prayers and our thoughts are with all the Oklahoma families that have been hit hard by this terrible storm. We are doing every single thing that we can to assist those that are in need right now.”

Moore was last hit hard by a tornado in 1999, which killed 36 people. That storm had the highest winds ever recorded near the earth’s surface, measured at 302mph.

The National Weather Service initially classified Monday’s storm as an EF4, the second-strongest type of tornado, with winds of up to 200 mph. Local reporters who were present for the 1999 storm, however, believe that the damage caused by this tornado is considerably worse.

A major utility company, Oklahoma Gas & Electric, has begun to assess damage to its electric grid following Monday’s tornado, according to a spokesperson.

Below is video purportedly of a Moore family emerging from their storm cellar, witnessing the devastation wrought by the powerful tornado.

A severe storm system over the weekend generated baseball-sized hail, high winds and at least 28 tornadoes in the Midwest, including Oklahoma, Kansas and Iowa. Residents remain in hiding as meteorologists forecast that the severe weather conditions will continue to generate destructive twisters.

Oklahoma Gov. Mary Fallin declared 16 counties to be disaster areas. Power companies reported that more than 57,000 outages left people in the dark. In Shawnee, Oklahoma, the body of a 79-year-old man was found lying in an open area of a mobile home community.

“You could be killed if not underground or in a tornado shelter,” read a National Weather Service alert posted Sunday. “Complete destruction of neighborhoods, businesses and vehicles will occur. Flying debris will be deadly to people and animals.”

In some regions, homes were destroyed, cars and trucks were flipped from highways, downed power lines were sprawled across neighborhoods, and trees were uprooted. The Oklahoma Highway Patrol shut down Interstate 40 after semi-tractor trailer trucks and several other vehicles were flipped by wind gusts, Newsok.com reported.

“It’s tearing up everything. Just ripping everything up in its sight,” a helicopter pilot told CNN affiliate KFOR, referencing a tornado near Wellston, Oklahoma. “Everything was just gone. Like you took the house, you put it in a gigantic blender, you turned it on pulse for a couple minutes and then you just dumped it out.”

The state was littered with debris from damaged houses, trailers, and vehicles. About 300 homes were in ruins and at least 23 people were injured, according to Fallin and Red Cross spokesperson Ken Garcia.

Ethan Mignard, a staffer at a local newspaper, told CNN’s iReport that the damage looked like something he had only ever seen on TV. In some areas, patches of dirt remained where mobile homes once stood, and children’s toys were littered across the ground and hanging from trees. Mignard even came across a plot of land with nothing remaining but the front steps to a house that is now gone.

“It looks so out of place… To think that you would have taken these stairs to enter a home, but instead, you look around from up there and you see total destruction everywhere,” he said.

Counties across Kansas, Nebraska, Iowa, Oklahoma, Minnesota, Wisconsin, Illinois and Missouri were all placed under tornado watch late Sunday, and are expected to witness more damage.

“After over 300 reports of severe weather on Sunday, another round of dangerous severe weather is expected Monday with the greatest threat once again in the southern Plains targeting Oklahoma and parts of Kansas, Missouri, and Arkansas,” the National Weather Service reported. “However, severe weather is possible much further north towards Chicago and Madison as well.”

Oklahoma City Tornado Video

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