A National Transportation Safety Board investigation of Saturday's fatal plane crash on the shore of Bear Lake near Garden City concluded Sunday, and the lead investigator says a preliminary report will be issued at the end of the week. It was the second investigation conducted by the agency in Utah over the weekend.

NTSB air safety investigator Kristi Dunks said Sunday her team, which consisted of representatives from the Federal Aviation Administration, Teledyne Continental Motors (an aircraft engine manufacturer,) and Cessna Aircraft would be completing their investigation of the crash site and sending the wreckage of the single-engine Cessna 180 to a secure holding facility in Phoenix, Ariz.

A man and woman from Washington state were killed in the crash Saturday, the day after three Blanding men died when their single-engine plane went down near Monticello.

Unlike the investigation in southern Utah, where no one actually saw the plane crash, Dunks was able to gather eyewitness testimony from 10 to 15 people, some of whom witnessed the entire incident. She said the witness statements could play an important role in the investigation.

"Any information we get in the course of an investigation is helpful," Dunks said. "In this case, the witness testimony will by very helpful in obtaining an accurate picture of what happened."

Dunks said a final report on the accident would take six to nine months to complete.