Borussia Moenchengladbach remained rock bottom of the German Bundesliga after a 2-1 defeat to local rivals Cologne on Sunday, in a match overshadowed by ugly scenes on the terraces.
The game was suspended for several minutes and riot police surrounded the away block after Gladbach fans appeared to fire fireworks into the home sections after Said El Mala's superb second-half winner.
That maintained pointless Gladbach's miserable start to the season as new coach Alexander Blessin failed to prevent the club falling to their fifth defeat in as many games.
The heated derby was a baptism of fire for Blessin, who replaced Eugen Polanski as Gladbach coach in September with the task of turning around a rapidly sinking ship.
Gladbach had the best chance in a cagey first 20 minutes when Philipp Sander stung the palms of Cologne goalkeeper Marvin Schwaebe with a fizzing free-kick.
Yet, it was the hosts who struck first thanks to a spectacular goal from Isak Bergmann Johannesson.
Johannesson pounced on a loose ball on the edge of the area after a Cologne free-kick, curling the ball into the top corner with an elegant, side-footed volley.
US international Joe Scally headed in an equaliser shortly before half time, celebrating provocatively in front of the Cologne fans.
El Mala missed a golden chance to restore the lead for Cologne after the break, shooting straight at the goalkeeper when both he and team mate Marius Buelter were through on goal.
Yet the 20-year-old, who made his international debut for Germany last week, made amends shortly afterwards.
In the 66th minute, he cut inside on the edge of the area and rifled the ball into the bottom corner.
That sparked the brief suspension of the game, before Cologne held on for their second win of the season, which moved them up into mid-table.