UPDATE - Monday, Mar. 6, 2017, 5:37 p.m.: Manatee County officials released the names of the two men killed in Saturday's plane crash.

David B. Muchler, 58, and Robert "Bob" Redfern, 90, died in the crash just north of State Road 62. Muchler was a resident of Raleigh, North Carolina, while Redfern had recently moved to Manatee County from Melbourne, Florida.

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Two people were killed in a two-engine plane crash Saturday afternoon in Manatee County. 

The plane went down near State Road 37, just north of State Road 62, around 1:30 p.m. 

The pilot and the passenger were both killed, officials said.

Two people riding their motorcycles said they witnessed the plane crash. 

"I looked up and I saw a plane coming down," said Don Williams. "A white private plane. It took a slow roll, went straight on down into the field. We all got off of our motorcycles, ran in to the area where the plane was."

"It wasn't just out of power. Something fatally happened to that plane because it was just spiraling pretty much straight down. At first I thought, the guy was doing some sort of stunt or something and at some point he realized, he can't, it's over," witness Paul Ballard said.

The crash sparked a 30-acre fire that temporarily shut down SR 37. 

The fire was completely out by Sunday morning and no homes were damaged. 

The National Transportation Safety Board was at the site Sunday to start its investigation into the crash, but said the brush fire makes it more challenging. 

"While that significantly impairs our ability to getting a complete understanding of the pre-accident condition of the airplane. There's still a significant amount of evidence to work with," said Brian Rayner, the NTSB Senior Air Safety Investigator. 

Investigators said the plane took off from Sarasota, but did not file a flight plan. They said preliminary information shows the plane may have been doing maneuvers in the air.

It could take them up to a year to determine the exact cause of the crash.