Jena, Germany - German police were seeking three Swedish nationals Monday, two days after neo-Nazis assaulted a group of leftists at a highway rest area at the end of a day of demonstrations in Dresden.

A 42-year-old man was hospitalized with serious head injuries in the eastern city of Jena after the Saturday evening violence.

Police took the names of 41 far-rightists riding in a chartered coach after the incident. They stressed Monday they had no evidence yet that the Swedes on the coach were specifically to blame, but wanted to catch them before they left Germany to go home to Sweden.

Some 6,000 rightists from several European nations marched Saturday in Dresden to publicize their claim that the city's 1945 bombing by the Allies was a war crime.

At the same time, 10,000 leftists and mainstream Germans demonstrated against a resurgence of the right.

Police said they did not arrest any of the rightists Saturday night as it was not known at that point that victims had been badly hurt in the violence at a roadside stop near the town of Stadtroda.

Leftists and trade unionists were travelling home in two buses from the demonstrations when they were attacked during a rest stop.

Police said a similar attack by homebound neo-Nazis on leftists at another highway stop left four persons slightly injured.

In Dresden itself, cordons of police had kept the two sides apart on Saturday and there were no serious injuries. (dpa)