A Vermont plane crash Sunday killed four Connecticut residents. Here's what we know and what we don't know so far.

The plane, a type of experimental aircraft that resembled an extensively modified Piper PA-12, crashed on a road near Finger Lake on Saturday morning, the NTSB’s Alaska chief said.

NTSB told hold media briefing at 3:30 p.m. ET today on its investigation into Sunday’s crash of a Piper PA-28R near Vergennes, Vermont. Briefing will be held at 685 Button Bay Road in Vergennes. pic.twitter.com/sgLQUlBUp8

A preliminary report into the plane crash that killed 4 CT residents will come within 30 days, but a final report could take up to two years, officials said.

Alaska State Troopers identified the men who died in the Sunday night crash as residents of Chugiak and Sterling, as well as Ohio and South Carolina.

An investigation is underway after a small airplane crashed near the Schaumburg Regional Airport in Roselle Wednesday morning.

The National Transportation Safety Board is investigating three separate plane crashes in Alaska that occurred over a three-day period.

Since 7 people have died in plane crashes, the National Transportation Safety Board has opened an investigation into the incidents.