Italian police have arrested a Moroccan man suspected of planning an attack on a Milan synagogue.

Italy's counter-terrorism unit says the 20-year-old man, who grew up in Italy, was arrested early Thursday near the Sardinian city of Cagliari.

Authorities say they found evidence on his computer detailing the synagogue's security, including the number of guards and potential access points.

They are working with U.S. and British authorities for possible connections in the case.

British police on Thursday arrested a Yemeni woman in London who had been in contact with the Moroccan suspect.