Prime Minister Ewa Kopacz has joined other dignitaries in signing a condolence book at the French Embassy in Warsaw in tribute to the victims of the 7 January Paris shootings.
''I am united in grief with the families and loved ones of the victims, as well as French society,'' the prime minister wrote.
''We are with you at this difficult time.
''We will remember those who died in this cruel attack.''
The condolence book was also signed by Speaker of Parliament Radoslaw Sikorski, and President Bronislaw Komorowski.
The latter told journalists that "we are with France not only in our thoughts and expressions of sympathy, but also in our firm intent on preventing any terrorist activities in Europe and the world.
''Therefore we are observing what is happening with grave concern and I hope that we will not have to deal with an escalation, and a spiral of similar events,'' he added.
Meanwhile, two days after the attack on the office of satirical weekly Charlie Hebdo, the manhunt continues for two suspects.
Counter terrorism police made house to house searches in the northern French countryside on Thursday following alleged sightings of the two brothers at a petrol station in the town of l'Aisne.
It has been reported that Said Kouachi, 34, spent several months in Yemen in 2011, where he was apparently trained by al-Qaeda.
Twelve people, including two police officers died in the attack on the office of the French weekly.