Tens of thousands of Poles including nationalist opposition chiefs walked through Warsaw on Monday in an annual Independence Day event held by the far-right, some shooting red flares and carrying anti-EU, anti-Ukraine and white supremacist banners. The march has become a point of friction between Poland's hard-right and conservatives on one hand and the liberal center, in power since a general election last year ended eight years of nationalist rule, on the other. The government of Donald Tusk has been in power since December but its leftist and center-right junior coalition members are struggling in opinion polls amid infighting over key campaign issues such as a return of abortion rights. Thousands carried red-and-white Polish flags on Monday, while some chanted "White Europe of brotherly nations!" or "Stop the European Union!", or carried banners reading "Stop mass migration" or "Stop turning Poland into Ukraine." Warsaw authorities said some 90,000 people took part in the march, while organisers put the attendance at around 200,000.