A special NIA court today summoned 13 Pakistani witnesses for deposing before it in connection with the 2007 Samjhauta Express blast case in which 68 people were killed.<br/><br/>The NIA spokesperson said in New Delhi today that Pakistani witnesses are required to attend the trial court at Panchkula in Haryana from July 4 onwards. He said the summonses to the witnesses will be sent through Ministry of Home Affairs and Ministry of External Affairs.<br/><br/>Sixty-eight people were charred to death in the blasts in two coaches of Samjhauta Express in Panipat on February 18, 2007.<br/>'<br/>