Organizers of the GP2 Asia series, having cancelled today's activities at the Sakhir circuit in Bahrain, have now cancelled the entire round, throwing further doubt on the forthcoming F1 test at the circuit and the season opener.

A brief statement issued at midday (UK time) read:

"Following the current events in Bahrain, at the request of the Bahrain Motorsport Federation, it has been decided that the remainder of the meeting which was supposed to take place this week at Bahrain International Circuit is cancelled due to force majeure."

According to reports, GP2 drivers could hear machine gun fire from their hotels while tanks patrolled the city centre. So far, it is understood that four people have been killed with several hundred injured.

The final pre-season test is due to begin at the Sakhir circuit next Thursday, with the first practice session for the Grand Prix taking place just over a week later.