ROSWELL, N.M.-- Authorities say four people are dead after a fiery crash of a test aircraft at Roswell airport.

The Federal Aviation Administration says two pilots and two flight test engineers were aboard the Gulfstream G-6 plane when it went down about 9:30 a.m. Saturday.

FAA spokesman Lynn Lunsford says the plane was practicing takeoffs and landings. He says it had just taken off when it rolled and slammed into the runway.

He says the plane's gear collapsed and the craft burst into flames.

There were no immediate reports of any other injuries.

Lunsford says the plane was owned by Georgia-based Gulfstream but it's not immediately known whether the four victims were employed by the company.