Feb. 27 - By Jeremy Smith BRUSSELS (Reuters) - A call by several EU states for tighter rules to prevent gene-modified seeds from contaminating other crops may be their next tactic to delay an end to the bloc`s virtual ban on GM food, officials said on Thursday. The European Commission will publish a report next week on how farmers can separate GM and non-GM crops.</p><p><a href="http://www.zs-l.de/gmo/downloads/reuters_27_02_2003.pdf">full story from Reuters</a>