Legia Warsaw won the Polish championship for the 13th time in the club's history on Sunday after they were granted a 3-0 walkover against Lech Poznan whose supporters threw flares and invaded the pitch. Referee Daniel Stefanski stopped the match in the 77th minute after Lech supporters threw flares spewing out dark smoke on to the pitch. Legia were leading 2-0 after goals from Domagoj Antolic and Michal Kucharczyk. After Kucharaczyk's goal, several dozen Lech supporters invaded the pitch and were chased away by some 200 policemen in riot gear. The Polish Ekstraklasa league commission decided later to grant Legia a 3-0 walkover against Lech, who said they would not appeal. 'As a result of this decision Legia has 70 points and has secured the title of the Polish champions. Lech Poznan has 60 points and the third place on the podium,' the Ekstraklasa commission said in a statement. Lech spokesman Lukasz Borowicz told state news agency PAP that the club were expecting 'serious consequences' after the trouble. 'We are not the only stadium where flares have been brought into and interrupted the match. It is too early today to estimate the losses,' he said.