Eurozone inflation fell to negative 0.1 percent in September after a gain of 0.1 percent the previous month, data showed Wednesday, suggesting a dangerous spell of falling prices could be returning.

Earlier this month, European Central Bank (ECB) head Mario Draghi warned that inflation in the 19-country eurozone could turn negative in the coming months, even if only temporarily.

The Eurostat statistics agency also said eurozone unemployment was unchanged at 11 percent in August.