South Korea intelligence says North Korea test may not be H-bomb

SEOUL (Reuters) - South Korea's intelligence agency said a device North Korea tested on Wednesday may not have been a hydrogen nuclear bomb, South Korea's Yonhap News Agency reported. South Korea's meteorological agency said separately that it had not detected any radiation after North Korea said it successfully conducted a hydrogen nuclear test. (Reporting by Se Young Lee, Meeyoung Cho, writing by Ju-min Park; Editing by Nick Macfie)