Prime Minister Tun Dr Mahathir said he was unaware that Johor Mentri Besar Datuk Osman Sapian had gone to Batam, Indonesia when the Pasir Gudang chemical dumping incident occurred.<br /><br />"Did he go? I don't know," said Dr Mahathir when asked on the matter at an event at the PICC in Putrajaya on Saturday.
