Police detained a man Tuesday who allegedly threw a jar of feces at a plaque at the presidential palace commemorating President Lech Kaczynski and 95 others who died in a plane crash in April in Russia, dpa reported.
Witnesses told broadcaster TVN that the man approached the plaque and threw the jar of feces to mixed reactions by bystanders, some of whom shouted "bravo" while others shouted "shame."
The man's motive was not known and police did not provide any further details.
Newly-elected President Bronislaw Komorowski sought on August 12 to defuse a row over a cross erected outside the presidential palace in memory of Kaczynski by placing a memorial plaque to the crash victims in a side wing.
Kaczynski supporters criticized the move, saying they were not consulted, and vowed to maintain their vigil outside the presidential palace until a permanent memorial is erected in place of the cross.
Currently the cross still stands outside the presidential palace, walled in by metal barricades and watched over by security guards.
Supporters of Kaczynski have opposed government plans to remove the cross placed at the palace soon after the April 10 plane crash in Russia.