Leflore County Emergency Management Agency Director Frank Randle told reporters at a briefing late Monday that 16 bodies had been recovered after the KC-130 spiraled into the ground about 85 miles (135 kilometers) north of Jackson in the Mississippi Delta. A witness said some bodies were found more than a mile from the crash site.
Marine Corps spokeswoman Capt. Sarah Burns said in a statement that a KC-130 "experienced a mishap" Monday evening but provided no details. The KC-130 is used as a refueling tanker.
Though the KC-130 refueling tanker took off from Marine Corps Air Station Cherry Point in North Carolina, Marine Capt. John Roberts said the plane was under the command of the 4th Marine Air Wing, which is part of the Marine Forces Reserve headquartered in New Orleans.
In a Tuesday morning tweet, President Donald Trump offered condolences.
"Marine Plane crash in Mississippi is heartbreaking. Melania and I send our deepest condolences to all!" Trump wrote.
Andy Jones said he was working on his family's catfish farm just before 4 p.m. when he heard a boom and looked up to see the plane corkscrewing downward with one engine smoking.
"You looked up and you saw the plane twirling around," he said. "It was spinning down."
Jones said the plane hit the ground behind trees in the soybean field, and by the time he and other reached the crash site, fires were burning too intensely to approach the wreckage. The force of the crash nearly flattened the plane, Jones said.
"Beans are about waist-high, and there wasn't much sticking out above the beans," he said.
Jones said a man borrowed his cellphone to report to authorities that there were bodies across U.S. Highway 82, more than a mile from the crash site.
Greenwood Fire Chief Marcus Banks told the Greenwood Commonwealth that debris from the plane was scattered in a radius of about 5 miles (8 kilometers).
Jones said firefighters tried to put out the fire at the main crash site but withdrew after an explosion forced them back. The fire produced towering plumes of black smoke visible for miles across the flat region and continued to burn after dusk, more than four hours after the crash.
Aerial pictures taken by WLBT-TV showed the skeleton of the plane burning strongly.
"It was one of the worst fires you can imagine," Jones said. He said the fire was punctuated by the pops of small explosions.
No more smoke was rising Tuesday morning from the site. State patrol units blocked all farm roads on U.S. Highway 82 about 2 miles (3 kilometers) away from the wreckage to keep anyone who wasn't law enforcement or a response unit out of the area.
Officials did not release information on what caused the crash.
Marine Corps Air Station Cherry Point is about 115 miles (185 kilometers) southeast of Raleigh and about 20 miles (30 kilometers) from the Atlantic Ocean.
The station was authorized by Congress just before the start of World War II. It supports the 2nd Marine Aviation Wing, providing, among other services, KC-130 aircraft used for in-flight refueling. The station covers 45 square miles (115 square kilometers) and has nearly 14,000 Marines, sailors and civilian employees.