The war of words between the Grand Prix Drivers' Association and the FIA, which has suddenly blown up in the last week, has taken a further twist.

Following Max Mosley's decision not to attend a scheduled meeting with the drivers on Friday, a number of them, indeed virtually everyone on the current F1 grid other than Michael Schumacher and the two Red Bull drivers (Coulthard and Klien), have signed a document in which they question Max Mosley's attitude towards safety.

The document refers to a telephone conversation which is said to have taken place between Coulthard and Mosley, the day before last week's hearing in Paris, during which Coulthard claims he was "threatened".

"We were concerned to learn that during the course of this telephone conversation, you suggested the FIA might withdraw support for the ongoing safety initiatives of the GPDA," read the letter.

"Previously the FIA had also dissuaded driver representation in Paris for the World Motor Sport Council meeting.

"The GPDA believes that safety issues are of the highest importance and are disappointed not to receive the full support of the FIA president in this matter."

More than anything else, Mosley regards improved safety, both on the race track and on the road, as his main legacy, and the Englishman will be unhappy at such a suggestion.

As the 'war' continues, it is interesting to note Coulthard's signature missing from the new document, especially since the Scot has been regarded as the ringleader up until now. Then again, the open letter comes on the day that he has agreed terms to remain with (the Ferrari powered) Red Bull team is 2006.