Doctors treating Israeli Prime Minister Ariel Sharon are becoming increasingly worried as they have not yet been able to rouse him from his coma, it has been reported. Mr Sharon has been in an induced coma since suffering a massive stroke, and doctors have been trying to revive him. The longer the process takes the greater the risk he suffered extensive brain damage when his haemorrhage occurred. Surgeons have removed a drain from his brain after a scan showed that most of the bleeding had been absorbed. But medical sources quoted on Israeli public radio described Mr Sharon's condition as "frightening".
