Crowd trouble has marred the Bulldogs' 29-22 NRL victory over ladder leaders Brisbane at Telstra Stadium.

A large firework which was detonated in the northern grandstand in the 69th minute was the main talking point of the game, despite the Bulldogs running out five tries to four to jump from 10th to fourth on the congested NRL ladder.

No one was injured by the explosion which sent a shudder around the stadium. Police were investigating the matter.

It was yet another controversy sparked by the Bulldogs fans.

Canterbury supporters were involved in ugly scenes during a 2004 round three 35-0 win by the Sydney Roosters at Aussie Stadium.

The NRL threatened to deduct four competition points from the Bulldogs for any repeat scenes but that expired at the end of 2004.

It took the shine off a polished performance by the Bulldogs who moved to a 9-1-8 record with their third straight win and fifth in six games.

The Broncos remain on top of the NRL ladder on 14-4 after suffering only their second loss in 14 games.

The Bulldogs looked set to run away with the game when prop Mark O'Meley pounced on a Brent Sherwin kick that ricocheted off the right upright to score in the 51st minute and make it 22-10.

However, Brisbane locked up the scores at 22-22 by the 60th minute after clever short passes by Broncos skipper Darren Lockyer set up tries to David Stagg (54th) and Tonie Carroll.

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