More than 300 police officers on Wednesday have been taking part in an extensive search operation in the area of Louny in the hopes of finding clues in several ongoing missing person cases. It is the largest such operation in the Ústí region in two years. The search is primarily for the body of Jana Pourová, a mother-of-four who disappeared in February 2013. Her husband is suspected of her murder but police have not been able to gather evidence to press charges. Two men in the Louny area have also been missing since 2010 and 2011. Along with sniffer dogs, police are relying on a remote-controlled helicopter drone, complete with a camera, to scan hard-to-reach terrain.