Warsaw, Jul 13 (AP) Prosecutors in Poland's capital said on Wednesday they are investigating a 31-year-old man who allegedly placed what police described as a projectile in a busy Warsaw street on suspicion of terrorism.

Due to the weight of the potential changes, the National Prosecutor's Office has taken over the investigation from regional prosecutors.

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The suspect was being questioned on allegations of terrorism by causing a sense of serious threat among a large number of people, according to Karol Borcholski, a spokesperson for the national office.

If convicted of that charge, he faces up to five years in prison, or even more if the court decides. He remains in custody.

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No one was reported injured, and the object did not explode. But over 300 people were participating in a commemorative march and rally for Polish victims massacred during World War II when the incident occurred Monday.

Police said after the man was detained that the explosive projectile had a potentially powerful range. An expert's detailed opinion on its type and capability was still pending.(AP)

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