A controversial affair at Tannadice ended in a 1-1 draw as Celtic came from behind to earn a replay against Dundee United in the Scottish Cup.
The game was shrouded in controversy, as two players were sent off in the opening 11 minutes, with Celtic's Virgil van Dijk and Dundee United's Paul Paton were both given their marching orders following a melee.
That ramped up the atmosphere at Tannadice, and after Celtic wasted a number of good openings, Dundee United took the lead - again in contentious circumstances.
Aidan Connolly went on a run into the box for Jackie McNamara's side, and after being clipped by Anthony Stokes, Nadir Ciftci converted from the spot.
Celtic pressed and pressed for the equaliser, and looked to have got their chance when Leigh Griffiths' goalbound shot was handballed on the line by Paul Dixon - who became the third player to be sent off.
Griffiths saw his penalty saved though, but made amends by heading home a great cross from Stefan Johansen to rescue a draw.
The teams must now face each other again in the replay, but Celtic will be disappointed to have not found a winner despite so much pressure.