The fact that he is of “Algerian origin” makes it quite likely that he is a jihadist. From AFP, with thanks to LGF:
WARSAW, Aug 18 (AFP) – Police have arrested a Frenchman near a gas pumping station in western Poland suspecting he is preparing a terrorist attack, an official from the Polish security services said on Wednesday.
“Michel N., 23, is being investigated for preparing actions which can endanger human life and destroy property,” Ewa Socha, the official following the matter at the public prosecutor’s office in the western city of Poznan told AFP.
“We had sufficient information at our disposal to be able to arrest him for three months,” she told AFP by telephone….
The suspect is of Algerian origin, according to Poland’s Fakt newspaper.
He “was arrested Friday while he was cycling around the pumping station at Swarzedz and taking photos of the site,” the newspaper said.
According to another newspaper, the Rzeczpospolita, he is suspected of “having prepared the ground to blow up the pumping station”.