Pakistan government today filed a petition at the Lahore High Court, seeking a ban on the free movement of renowned nuclear scientist Abdul Qadeer Khan. <br/><br/>Local TV report said the petition said the liberty granted to Qadeer is a threat to national security. <br/><br/>According to reports the nuclear scientist has shared sensitive information in an interview with an American newspaper. <br/><br/>Earlier the High Court had granted permission to Qadeer to live as a free citizen. <br/><br/>The government has appealed that the scientist be kept under constant surveillance by authorities and a security escort be assigned to him. <br/><br/>It said the restrictions are necessary for his own safety. The court has issued notification to Qadeer for January 25.