Angel Correa scored a dramatic stoppage-time equaliser for Atletico Madrid against city rivals Real Madrid in a derby that was halted for about 20 minutes midway through the second half following crowd issues.
Shortly after Eder Militao scored Real's opener in the 64th minute, visiting goalkeeper Thibaut Courtois complained to officials that home fans behind his goal were throwing objects on to the field.
An announcement was made over the public address system inside Atletico's stadium and, after speaking to both managers, the referee asked the teams to return to their respective dressing rooms.
Atletico manager Diego Simeone and several of his players attempted to calm the situation by speaking to a group of home supporters in the stand.
Play resumed and Brazil centre-back Militao's earlier deflected strike from inside the box looked like being enough for a Real victory.
However, substitute Correa rounded Courtois to bundle home the leveller and, although the goal was initially disallowed, it was later awarded when the video assistant referee (VAR) confirmed the Argentina international was onside when racing on to the through ball.
There was still time for Atletico's Marcos Llorente to be sent off for a lunging late challenge on Fran Garcia, in a derby contest that only came to life following the temporary suspension.
Simeone was critical of Courtois for celebrating Madrid's goal while looking at the supporters behind him.
"You can celebrate a goal but not by looking at the fans, having a go, making gestures like that," Simeone told DAZN.
"The fans don't just become angry by themselves, they become angry for a reason."
However, the Argentine said those that threw objects should be punished even if they were provoked.
"My opinion is that people who have committed incidents should be sanctioned by the club. We don't need these people. We need the people who accompany and support us," said Simeone.
"We all have to help. The people who have thrown those lighters, it's not right. But maybe it doesn't help when us, the protagonists, undermine people, charge against people, provoke people and then people get angry.
"Of course it's not justified, but neither is the initial thing justified because otherwise we'll always be victims. The one who throws the cigarette lighter should be sanctioned and the one who provokes should also be sanctioned."
Atletico say they are working with police to investigate the incident and have already identified one fan who threw an object on to the pitch.