Poison frontman Bret Michaels is still in intensive care following a brain haemorrhage last Friday (April 23).According to his official website, the singer is undergoing further tests to help locate the cause of the bleeding."Bret remains in ICU under 24 hour surveillance," reads a post on the site. "Further testing this week will help locate the source of the bleeding."Please remember Bret is, and always has been, a fighter and survivor and is under the best medical care possible," the post adds.