Xevi Pujolar, race engineer to Williams driver Pastor Maldonado, uploaded a photo to Twitter reporting that "all [is] normal outside", while HRT driver and chairman of the Grand Prix Drivers' Association Pedro de la Rosa remarked that he was not concerned about the safety of the event. Reigning World Champion Sebastian Vettel added that he felt Bahrain was no more dangerous than Brazil; at the 2010 Brazilian Grand Prix in São Paulo, 2009 World Champion Jenson Button was involved in an incident in which armed gunmen attempted to hold up his road car after he left the circuit. Vettel's comments attracted criticism from former driver Rubens Barrichello, who said that there was no comparison between Brazil and Bahrain. Several drivers, including Button, Michael Schumacher and Romain Grosjean refused to comment either way on the political situation in Bahrain, reiterating their belief that the sport and local politics should be kept separate. In an opinion piece for "The Independent", journalist Robert Fisk launched a scathing attack on the drivers for their neutral stance, calling Sebastian Vettel "clueless" and accusing Jenson Button and Lewis Hamilton of double standards, concluding that sports people in the 21st Century could no longer afford to distance themselves from moral values.