SOFIA, Nov 27 - Police in the northern town of Lovech detained 30 Levski Sofia fans after trouble erupted following their Bulgarian premier league match with Litex Lovech, a police spokesman said on Monday.

Champions and front-runners Levski drew 0-0 at fourth-placed Litex to stay unbeaten after the first half of the league season but the game was marred by clashes between police and Levski fans.

Thirty Levski fans were detained after the brawl," said police spokesman Gabriela Todorova. "They assaulted the security staff on their way out of the stadium and provoked a fight.

"Charges will be pressed against 27-year-old man for violent behaviour. One policeman suffered a broken nose."

Earlier this month, the club were fined $40,230 by UEFA because of crowd trouble during their Champions League match against Chelsea on September 27.

Levski were fined $117,000 in total by the European governing body last season because of the bad behaviour of fans during the team's run to the UEFA Cup quarter-finals.

Last week, club owner Todor Batkov called for "European behaviour" but little has changed since.

Fans threw torches and fireworks during their Champions League match with holders Barcelona on Wednesday and the club expect another heavy fine.