• An investigation is underway into Romain Grosjean's fiery crash at the Bahrain Grand Prix.
• The International Automobile Federation (FIA) said it had "initiated a detailed analysis of Romain Grosjean's accident at the 2020 Bahrain Grand Prix".
• The investigation will focus on Grosjean's helmet, safety harness, headrest, in-car extinguisher and halo protection.
Motor racing chiefs announced on Thursday the launch of an investigation into Romain Grosjean's fiery Bahrain crash, saying the forensic probe would take "around six to eight" weeks to complete.
The French Formula 1 driver somehow wrenched himself free from his blazing Haas car with just burns to his hands and a broken left foot after a collision with Daniil Kvyat on the first lap of Sunday's Grand Prix. He left hospital on Wednesday.
In the immediate aftermath of the shocking smash there was widespread praise for modern safety measures in the sport, but also concern over what F1's motor sport managing director Ross Brawn described as "unpredictable" failures.
The International Automobile Federation (FIA) said it had "initiated a detailed analysis of Romain Grosjean's accident at the 2020 Bahrain Grand Prix".
The FIA's safety director, Adam Baker, said: "With so much data available in Formula 1, it allows us to accurately determine every element of what occurred and this work has already begun.
"We take this research very seriously and will follow a rigorous process to find out exactly what happened before proposing potential improvements."
The FIA probe will look at a range of factors including Grosjean's helmet, safety harness, headrest, in-car extinguisher and the Halo cockpit protection.
The Halo device is widely considered to have helped save Grosjean's life as his car was sliced in two after careering into a barrier.
"The 'halo' saved the day and it saved Romain.," Brawn said on Sunday.
"There was controversy in developing it initially, but there can't be any doubt now, so hats off to those who pushed for the introduction."
But he added: "The fire is worrying. The split in the barrier is worrying and the barrier coming apart, but we can be happy with the safety of the car -- that got us through today, but things failed in an unpredictable way.
"We haven't seen anything like that for a very long time, but the barrier splitting normally results in a fatality."
At the circuit new safety measures have been introduced to reduce the risk of a repeat crash at this Sunday's Sakhir Grand Prix.
Two rows of tyres wrapped in a conveyor belt have been installed in front of a reconstructed guardrail at the exit of Turn Three.
Several drivers expressed serious concerns at the failure of the barrier and the manner in which it was punctured.
In other changes to the circuit, where this weekend's Grand Prix will be using the shorter''outer loop', a kerb has been removed at Turn Nine - which was used as Turn 13 last Sunday - and a tyre barrier in the approach to that corner has been extended and enlarged to four rows in depth.
Grosjean left hospital on Wednesday and in an Instagram post he highlighted the professionalism of a marshal with an extinguisher and the FIA doctor in the following Safety Car, who was on the scene very quickly.
"I told him he was a hero," said Grosjean.
"He went into the fire as much as he could to save me. I felt Ian's hands pulling me over the barrier and I knew I was safe... life will never be the same again."
Grosjean is resting and healing from burns at a hotel in Abu Dhabi where he hopes he will be fit enough to race in the season-closing race next weekend.