He said "gun shots were fired" and a weapon was held to the head of one team member.
British driver George Russell, the 19-year-old GP3 champion, made his grand prix weekend debut with Force India and was an impressive 12th fastest at an unfamiliar circuit and in a vehicle he had not driven before.
Showing no sign of letting up despite clinching his fourth world title in Mexico at the end of October, Hamilton lapped the anti-clockwise track with a best time of one minute 09.202 seconds in the sunny morning session. "Please say a prayer for my guys who are here as professionals today even if shaken", wrote Hamilton.
"This happens every single year here. F1 and the teams need to do more, there's no excuse!"
Lewis Hamilton described his crash in qualifying for the Brazilian Grand Prix as "very unusual", after he crashed out of qualifying for the first time since Azerbaijan 2016. The team confirmed it had witnessed a van being targeted at gun point ahead of them, but they were able to get away. In a statement, Mercedes said, "Valuables were stolen but everybody is safe and uninjured which is the main thing". It is said that staff from the FIA's governing body and Williams F1 team crew members were also targeted in separate incidents but managed to escape unharmed.
In 2016, ahead of the Mexican Grand Prix, a chauffeur-driven auto was looted by a gunman as a team member was being transported to the hotel from the Mexico airport.
"That is why I am really looking forward to these last two races".
Three Sauber engineers were robbed at gunpoint on the same evening.