(CNN) -- The National Transportation Safety Board has launched an investigation into the cause of a plane crash that killed three people in Oklahoma on Saturday.
The Cessna 421 plane had taken off from Pontiac, Michigan, and was headed inbound to Tulsa, Oklahoma, when it went down late Saturday night, said Federal Aviation Administration spokeswoman Elizabeth Isham Corey.
The three men, executives with high-end off-road motorcycle maker US Highland Inc. in Glenpool, were returning from a business trip, reported CNN affiliate KJRH.
It was the second of two fatal plane crashes in Oklahoma over the weekend.
In Owasso, a single-engine Cessna nose-dived into a backyard near Gundy's Airport on Sunday night, KJRH said. Three people were killed, according to the sheriff's office in Rogers County, where Owasso is located.