The Mossad may have abducted Palestinian engineer Dirar Abu Sisi in the Ukraine last month because Jerusalem believed he had information relating to Gilad Schalit, Der Spiegel quoted a source as saying on their website Tuesday.

Abu Sisi went missing on a train traveling from Kharkov to Kiev on February 19 and later was revealed to be at the Shikma prison in Ashkelon.

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Der Spiegel quoted an additional informant as saying that Abu Sisi was considered by Israel to be a high ranking Hamas member who possessed important secret information.

"If Mossad goes to such an expense, and interrogates the man for six weeks, then he must know something Israel absolutely wants to hear," the source was quoted as saying.

Abu Sisi, one of the managers of the only power plant in the Gaza Strip, has claimed to have no affiliation with Hamas.

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