Wheeling, Ill ? Investigators say no distress calls came from a twin-engine airplane that nose-dived into an industrial park a mile away from its destination in Chicago’s northwest suburbs, killing all four aboard.

An eyewitness reported and surveillance video showed that the twin-engine plane was nearly vertical before it crashed around 6:30 p.m. Monday about a mile from its planned landing at Palwaukee Municipal Airport, federal investigators said Tuesday.

Family, friends and business associates identified the four victims as Kenneth Knudson, 61, Mark Turek, 59, Michael Waugh, 36, and Scott Garland, 40.

It was still too early for investigators to know what caused the 1974 Cessna 421B inbound from Olathe, Kan., to crash, said John Brannen, an investigator for the National Transportation Safety Board.

The NTSB moved the remaining parts of the wreckage to an indoor facility Wednesday, and investigators expected to gather the plane’s service and crew certification records, Brannen said.

NTSB investigators spent Tuesday sifting through the blackened wreckage and gathering records. A review of a preliminary transcript of tower communications from Monday night did not find evidence the plane made any distress calls, Brannen said.

But an eyewitness reported that the plane seemed to be in a “near vertical” position just before impact, Brannen said.

The victims were a hotelier, a restaurateur and two financiers.

Knudson, of Lake Zurich, was founder and owner of Sybaris Clubs International Inc., which provides romantic getaways for married couples and has locations in northern Illinois, Indianapolis and Mequon, Wis.

Sybaris Vice President Rande Repke said Knudson had been “a flying enthusiast for about 40 years” and had a pilot’s license.

Donna Turek said that her husband, a financial adviser with Morgan Stanley, had been piloting the plane he co-owned with Knudson, who she said was co-pilot.

Mark Turek, of Winnetka, had been a LifeLine Pilot since 2000, according to Karen Halverson, assistant director of the Peoria-based humanitarian organization that shuttles needy patients to hospitals.

Waugh, of Algonquin, was operating partner at Joe’s Seafood, Prime Steak and Stone Crab, according to Michael Rotolo, operations manager at the downtown Chicago restaurant. Garland, of Chicago, who also worked for Morgan Stanley, was Waugh’s good friend and financial adviser, Rotolo said.