Uncertainty continues to surround the plane crash that took the life of at least 189 people in Sao Paolo in Brazil on Thursday.

The initial blame was assigned to the slippery runway at the city's Congonhas, but eyewitness footage broadcast by Globo TV shows the Airbus A320 jet moving a lot faster than other planes.

It appears the pilot of the TAM Airlines plane tried to accelerate and lift off, but managed only to clear the major boulevard passing next to the airfield before crashing into a fuel deposit.

"That [the pilot] jumped over the avenue was an indication he tried to take off. If he didn't, he would have gone nose down at the end of the runway," the BBC quoted Brazil's top air safety official Jose Carlos Pereira as saying.

It has also emerged that one of the plane's reverse thrusters, used for breaking, was not functional, although the airline said it was "de-activated" in line with Airbus maintenance regulations.

The problem with the thrusters was discovered four days ago. Under Brazilian regulations, an inspection has to be carried out within 10 days, but the plane can fly in the meantime.

The investigators hope that the information from the two flight recorders, which have been sent to the US for study, will help clear the circumstances of the incident, the country's worst air accident ever and the second major crash in less than a year.

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