WARSAW, Poland — Polish security services have detained a student suspected of preparing a “mass attack” at a Christmas market, Jacek Dobrzynski, a spokesperson for Poland’s special services, said on Tuesday.

Mateusz W., a student at the Catholic University of Lublin, wanted to commit an attack using explosives and planned to join a terrorist organization, he said.

“The aim of the crime was to intimidate many people and support Islamic State. During the investigation, Internal Security Agency officers seized data carriers and items related to Islam,” Dobrzynski wrote on platform........

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