A Hamas spokesman says Ukraine must investigate how a Palestinian man was seized from a Ukrainian train and apparently transferred to Israeli custody.
Hamas Interior Ministry spokesman Ihab Ghussein said Friday that if reports Dirar Abu Sisi is being held in Israel are correct, Ukrainian authorities must "uncover the facts."
Ukraine's government has said Abu Sisi disappeared February 19 from a train from Kharkiv to Kiev "under unknown circumstances." Ukraine would not comment further Friday.
An Israeli rights group and a U.N. refugee agency official have said Israel is holding him. His Ukrainian wife alleges Israeli agents kidnapped him in order to sabotage a key power plant in Hamas-controlled Gaza Strip where he worked.
Israel has not commented.