Porsche is telling owners of the newly launched 911 GT3 to stop driving their cars and take them back to dealers for checking as it continues to investigate two cases in Europe where engine fires gutted cars.

Britain's Daily Telegraph said the VW-owned company had upgraded its advice from Wednesday this week after Porsche UK confirmed its German headquarters had halted all new deliveries while engineers searched for the cause of the fires.

In the UK just over 100 GT3s are affected out of a global total of 785 cars sold since deliveries started late last year. Deliveries of a further 1,000 cars have been halted, according to Porsche.

"Safety is the top priority and owners have been advised not to use their car," a spokesman for Porsche UK told the Telegraph. The paper said the automaker would offer to transport the car back to the dealership for an inspection of the engine however the spokesman denied it was a recall.

"It’s not a recall in the strict sense of the word. We’re offering customers the opportunity to bring the car back." He said Porsche’s investigations in Germany into the cause of the two fires had not yet been concluded.

Despite the UK denial of a recall, that is the wording used in a Reuters report on Thursday which said Porsche "would recall all 785 examples of its 911 GT3 sports car that have been delivered worldwide this year..."

The Telegraph report noted Ferrari in 2010 recalled all models of its then newly launched 458 supercar after a spate of fires were traced back the glue used to secure the rear wheel arch lining to the car’s chassis, which was found to be liable to catch alight when the car was driven for a long time at high speed.