At least five people have fled the cafe , Seven Network video shows . Police negotiators are in contact with a hostage taker , the official says . Footage showed them holding up a black flag with Arabic writing on it that reads : `` There is no God but God and Mohammed Australia 's PM says it 's unclear whether the violence is politically motivated . Comment:
At least five people have fled the cafe , Seven Network video shows . Police negotiators are in contact with a hostage taker , the official says . Australia 's PM says it 's unclear whether the violence is politically motivated . Comment: