Sweden says it has received a formal request from Poland to help investigate the spectacular theft of the infamous Auschwitz death camp sign.
Justice Ministry spokesman Martin Valfridsson said Tuesday that Sweden was asked to supply legal assistance early Tuesday. He could not give more details.
The "Arbeit Macht Frei" ("Work Sets You Free") sign, was stolen in December and found two days later cut into three pieces. Police have arrested five men in connection with the theft.
Poland's request fuels speculation that there may be a Swedish link to the heist.
There has been media speculation that the sign may have been ordered by a collector living in Sweden, but investigators have not confirmed that.