The commemorations marked 54 years since Poland’s former communist rulers in December 1970 ordered the army and police to open fire on protesting workers on the country’s Baltic coast, killing at least 45.
Government officials and local leaders have attended ceremonies to light candles and pay respects in front of memorials in the northern port cities of Gdynia and Gdańsk.
In December 1970, drastic price rises led to massive, more than weeklong protests in Gdynia as well as Gdańsk and Szczecin in northern Poland, triggering one of the most brutal crackdowns of the communist era.
At least 45 people were killed and more than 1,100 injured after police and soldiers opened fire on protesters, who also demanded a change of government and freedom of speech.
December 17, 1970, so-called "Black Thursday," marked the worst day of the crackdown.
Solidarity, the first independent trade union in a Warsaw Pact country, was founded in August 1980 at the Gdańsk shipyard.
It played a key role in bringing about the collapse of communist rule in Poland in 1989.
(gs)
Source: IAR, PAP