Sunday 's abduction was the latest in a string of kidnappings of foreign workers in Yemen this year . South Korean soldiers , two German nurses in training are dead , it says . Initial reports blamed Shiite militants in abductions . But Houthi rebels blame drug cartels and regional tribes , news agency said .
South Korean soldiers , two German nurses in training are dead , it says . Initial reports blamed Shiite militants in abductions . But Houthi rebels blame drug cartels and regional tribes , news agency said .