MILAN (AFP)--Workers at the Fiat SpA (F.MI) plant of Termini Imerese in Sicily went on strike for an hour and a half Monday, fearing the closure of their plant should the Italian automaker take over General Motors Corp (GM) German unit Opel, a union official said.

The strike was called by three unions, the Fiom-CGIL, Fim and Uilm, and half the morning shift responded as well as numerous employees of sub-contractors, Roberto Mastrosimone, local head of the Fiom-CGIL, said.

The Termini Imerese plant, which employs 1,700 people in total, was resuming full production Monday after the Fiat workers had been laid off for two weeks.

Mastrosimone said they had been on part-time working for five of the last eight months, and they were protesting against the possible closure of their plant.

Fiat's plans remain unclear in the event of it taking over the European activities of General Motors, including Opel, raising strong concerns over job losses in Italy and Germany.

The head of Fiat, Sergio Marchionne, said he would favor reducing production in its factories instead of simply closing them, according to the current edition of The Economist weekly.

But according to a document submitted to the German government by Fiat and cited by Dow Jones Newswires and German daily Handelsblatt, Fiat could close sites in Germany, Italy, the U.K. and Austria if it took over Opel.

Italian unions, who are to meet their German colleagues in Frankfurt Wednesday, are particularly worried over Termini Imerese and the Pomigliano plant, near Naples.

Delegates from Termini Imerese will join a national demonstration of Fiat workers Saturday, near the headquarters of the group in Turin.