Three men attacked a 20-year-old woman and a 21-year-old man in the Polish city on Sunday.
Footage circulated on social media showed the woman being beaten as she tried to shield her partner from the attackers.
Police said the assault began as a dispute in a shop queue before escalating into a street attack, and that they were treating it as a hate crime linked to nationality.
The victims were taken to hospital by an ambulance; the woman needed stitches for an ear injury.
Two suspects, aged 27 and 45, were detained on Monday evening.
Prosecutors in Wrocław have charged the younger man—named only as Tomasz M. in line with Polish privacy rules—with assault and violence motivated by nationality, an offence carrying a possible five-year prison sentence.
A similar charge was expected to be brought against the second suspect, identified as Adam C.
Police are still searching for a third attacker.
According to reports in the Polish media, Adam C. has a criminal record and is a bare-knuckle boxer, while Tomasz M. has been described as a football hooligan who has competed in MMA.
Speaking before a Cabinet meeting on Tuesday, Tusk said Poland could not allow "thugs" to beat and humiliate people simply for speaking with a different accent, warning this would undermine the reputation Poland has built internationally through its support for Ukraine following Russia's invasion.
He noted that one of the detained men had described himself on social media as a "defender of Poland's borders," and linked the attack to nationalist groups he said promote themselves as patriots while damaging the country's standing.
Tusk called on President Karol Nawrocki, an ally of the right-wing opposition, to speak out on the issue, criticising him for previously praising underground street fighting as noble combat between men.
The prime minister also urged opposition leader Jarosław Kaczyński to stop calling for the formation of vigilante groups, and appealed to the public to report acts of violence to police rather than remain silent.
"I call on everyone to stand firmly on the side of the state, the police, and the weaker—women and children being beaten today not just by thugs, but sometimes by politically deluded people too," Tusk said.
(ał/gs)
Source: PAP