The security staff of DUS seems to be on strike today (January 25, 2013) as well. The airport of Düsseldorf (http://www.duesseldorf-international.de/dus_en/) has so far not updated the homepage with up to date information of today.

Here is the current information of Lufthansa:
http://www.lufthansa.com/de/en/Travel-information

It could take up to four hours to pass security according to reports in the news ...