Formula One bosses say they cannot be held responsible for the security failings which dogged the Brazilian Grand Prix and have urged chiefs of the Interlagos circuit to find a solution to the issue in time for the 2018 race.
A series of attacks on F1 staff took place during the visit to Sao Paulo, with a minibus carrying Mercedes personnel robbed at gunpoint on Friday evening. Williams and Sauber staff also found themselves in threatening situations over the weekend, while a car carrying FIA officials was attacked when leaving the circuit.
Another incident, an attempted robbery of Pirelli staff on Sunday evening, prompted F1's tyre manufacturer and McLaren to cancel a two-day test scheduled to take place at Interlagos this week due to fears over safety.