Three Sauber engineers were robbed at gunpoint shortly after Formula One world champion Jenson Button escaped unhurt from a similar attack at the Brazilian Grand Prix.
A Sauber spokesman says the three engineers left the track together in a van, at around 8 p.m. on Saturday (local time) and when they stopped at the red light five people surrounded the car, one with a machine gun.
The attackers then opened the door and took two rucksacks and disappeared.
Nobody was injured.
McLaren's Button was the victim of an attempted armed robbery about an hour earlier but his police driver smashed his way through traffic to escape when the gunmen were seen approaching.
Button told reporters on his arrival at the circuit that he was fine but shaken by the incident.
Button, still just in mathematical contention for the title ahead of the penultimate race of the season, says his bullet-proof Mercedes -- with blacked-out windows -- had pulled up at a traffic light outside the circuit.
Sitting in the front passenger seat, he noticed a group of men loitering suspiciously by the side of the road at the entrance to one of the buildings that masks the shanty town behind.
When the men started running towards his car Button's driver rammed through several cars to get away.
Teams are always on the watch for attempted armed attacks on members leaving the circuit after previous incidents in Sao Paulo, a sprawling city with one of the highest crime rates in South America.
