Former Sheffield United midfielder Michael Tonge rescued a point for Leeds to deny Yorkshire rivals Sheffield Wednesday in a 1-1 derby clash marred by crowd trouble.
Tonge, who spent a large chunk of his career under former Sheffield United boss Neil Warnock, fired home a swerving 25-yard shot in the 76th minute to cancel out Jay Bothroyd's first-half header and deny Wednesday a first win in eight league matches.
But despite rescuing a point with a much-improved second-half display, Leeds are sure to find themselves in serious trouble from the game's authorities after the mindless antics of one fan in particular, who celebrated Tonge's fine equaliser by running on to the pitch and hitting Wednesday goalkeeper Chris Kirkland in the face with two hands.
Riot police had earlier filtered out to try and diffuse ugly scenes in the away end prior to Tonge's strike, with bottles thrown between baying sets of home and away supporters.
Leeds boss Warnock, returning to his home city for the first time since former club Crystal Palace triumphed over the Owls at Hillsborough in an FA Cup tie in 2010, will have been grateful for Tonge's rescue act after his side stretched their unbeaten run to five matches despite being outplayed for long periods.
Leeds were given a real let-off in the 23rd minute by referee Eddie Ilderton, who somehow failed to see Leeds forward Luciano Becchio handle the ball when diving in his own penalty area to head clear Bothroyd's 23rd-minute corner.
But Wednesday, belying their lowly status, secured the lead they deserved two minutes before the break. Long-throw specialist Michail Antonio launched a missile into the Leeds box from the left and Bothroyd rose highest to head home unopposed, low into Kenny's right-hand corner.
Leeds were more purposeful after the restart and went close to an equaliser through another free-kick from Tongue after Gardner had been booked for his high tackle on Diouf.
Tonge's brilliant equaliser in the 76th minute following Aidy White's lay-off then prompted some Leeds fans to pour through fencing, with one supporter run round in front of Kirkland's goal before pole-axing the Wednesday keeper by pushing both hands into his face.
Kirkland required treatment before the game could resume and although Owls substitute Danny Mayor went close with a shot blocked by Jason Pearce in the closing stages, the home side had to settle for a point.