International investigators said they identified the suspect as the author of a comment on am IS-linked Facebook page vowing willingness to become a jihadist "martyr".
The suspect also belonged to a jihadist Facebook group called "Converts to Islam", according to the investigators.
The Algerian was deported after his release from Milan's San Vittore prison, where he had been put under surveillance, the ministry said.
A total of 306 suspected Islamic extremists have been expelled from Italy since January 2015, of whom 69 were deported this year, according to the ministry.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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