"Bahrain's government has spent $40 million to host the global luxury sporting event, hoping to demonstrate that normal life has returned to the Gulf island kingdom after it cracked down harshly on Arab Spring demonstrations last year. But vivid televised images of streets ablaze - as masked youths hurl petrol bombs and police fire teargas and birdshot - threaten to embarrass Formula One and the global brands that lavish it with sponsorship. "The government are using the Formula One race to serve their PR campaign," said rights activist Nabeel Rajab. "It's not turning out the way they wanted.""