Arsenal saw their Barclays Premier League title hopes all but extinguished after Dirk Kuyt secured a point for Liverpool with a last-gasp penalty just moments after Robin van Persie's own spot-kick had looked enough for victory.
The Gunners - now six point points behind leaders Manchester United having played the same number of games - had plenty of possession and hit the bar in the first half through Laurent Koscielny, but were unable to make their dominance count until deep into eight minutes of stoppage time when van Persie crashed home a spot-kick.
However, Liverpool - who had earlier seen captain Jamie Carragher carried off following a nasty clash of heads - snatched a point with the final kick of the match after Emmanuel Eboue had pushed Lucas Leiva.
While the match ended in high drama, before kick-off there was a minute's silence in memory of late Arsenal director Danny Fiszman, who passed away following a battle against cancer and also remembering the 96 Liverpool supporters who died 22 years ago this week in the Hillsborough tragedy.
The sale of Fiszman's holding in the Gunners' parent company led to American Stan Kroenke crossing the takeover threshold, but it remains to be seen whether the Denver-based entrepreneur will be able to complete his proposed £730millon buyout.
When the action got under way, Arsenal - unbeaten in 14 matches and yet to lose in 2011 - started well, with Abou Diaby glancing a header wide from Samir Nasri's curling free-kick.
Arsenal were careless in possession far too often, with Liverpool quick to capitalize on the break.
The hosts sparked into life, though, after 12 minutes when Theo Walcott stung Pepe Reina with a fierce 25-yard drive which the Reds keeper spilled and van Persie hooked the loose ball back across an open goal, which was headed behind.
From van Persie's right-wing corner, Laurent Koscielny got up above the Liverpool defence and in front of Reina to crash a header against the bar.
Liverpool were forced into a change on 21 minutes when full-back Fabio Aurelio limped off with a recurrence of his hamstring problem, replaced by 17-year-old Jack Robinson for a second senior appearance.
Luis Suarez's slip allowed van Persie and Cesc Fabregas to open up the Liverpool defence, but the Arsenal skipper drilled his 20-yard shot wide.
Liverpool were being pegged back, with Walcott firing a low ball in from the right which was booted behind.
It continued to be one-way traffic with Liverpool defending deep, but Arsenal could not find a telling pass in the final third.
In first-half stoppage time, Eboue's angled drive at the near post was deflected across the face of goal and away.
It was again a bright opening by Liverpool after the restart. Suarez created space for himself at the edge of the Arsenal penalty area, but dragged his shot wide.
There was a scare for the visitors when Andy Carroll went down after twisting his knee and ankle when challenging for a loose ball in the box. After some treatment, though, the £35million England man was back in the action.
Reds skipper Carragher then appeared to have been knocked unconscious after a clash of heads with John Flanagan, sparking more anxious scenes on the visitors bench as the medical staff from both teams attended.
The former England defender was eventually carried off on a stretcher, his neck in a brace and given oxygen. Sotirios Kyrgiakos came on as a substitute.
With 20 minutes left, Carroll was replaced by Jonjo Shelvey before Arsenal made a double change when Jack Wilshere and Walcott were replaced by Nicklas Bendtner and Andrey Arshavin, the Russian making his 100th appearance for the Gunners.
Wojciech Szczesny got down well to beat away an angled shot from Suarez as Liverpool looked to snatch all three points.
Reina made a decent block when van Persie was played into the left side of the Liverpool area, before at the other end, Suarez spooned his shot high and wide in space at the near post.
Because of the injury to Carragher, there were some eight minutes of stoppage time, and just when that seemed to be running out, Fabregas went tumbling over Jay Spearing's leg and this time, the referee pointed to the spot.
Van Persie stepped up to send Reina the wrong way and seemingly keep Arsenal in the title hunt.
However, there was more late drama after Alex Song tripped Lucas right on the edge of the area.
Suarez's free-kick went into the wall, but Eboue then pushed over Lucas to conceded another stoppage-time spot-kick which Kuyt dispatched.
It proved the last action of an amazing end to the game, which leaves Arsenal all but out of the title race and left a dejected Arsene Wenger confronting the officials - and opposite number Kenny Dalglish as they walked off.