A hunger striker who is feared to be close to death and a bomb blast that injured seven policemen have increased tensions over next weekend's planned Bahrain Grand Prix…supporters of Abdulhadi al-Khawaja, an imprisoned anti-government activist who has been on hunger strike…are growing increasingly concerned for his health after being denied contact with him since Sunday…Ecclestone said there were commercial reasons why teams should take part in Sunday's race but admitted he could not force them to participate…Ecclestone added that no team had told him it wanted to pull out, but one team has told the Guardian the race should not go ahead…