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Federal officials said Thursday that a private jet that ran off a runway and crashed through a fence before bursting into flames at a Texas airport had not been flown since December and investigators are investigating the plane’s maintenance. are.

National Transportation Safety Board member Michael Graham said the plane left 1,200 feet (365 meters) of tire marks on the runway at Houston Executive Airport in Brookshire, Texas, on Tuesday.

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“There was a massive braking incident, which appears to be an aborted takeoff, so we know the brakes were working effectively before the plane exited the runway,” Graham said at a briefing.

Graham did not speculate as to why the pilots applied the brakes or why they were unable to stop the McDonnell Douglas MD-87. He said investigators were questioning the two pilots and the plane’s mechanic.

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Plane crashes in Texas field, 21 on board, investigation underway

Graham also said investigators were reviewing a video showing a plume of smoke from one of the two engines as the plane went down the runway.

Texas plane crash survivors headed to Astros game in Boston: ‘Shaky and shocked’

According to the board, the plane was consumed by flames and left behind charred debris, but all 21 people on board survived and only two of them suffered minor injuries. The aircraft was owned by a Houston area investment firm and the firm owned the aircraft.

NTSB recovers plane’s flight recorders and has begun analyzing them in his laboratory in Washington.

The board typically takes 12 to 18 months to issue a final report and determine the cause of the accident.

This article first appeared on the AP Newsroom