Just Stop Oil protesters stopped play at the World Snooker Championship yesterday after pouring orange powder over one of the tables.
The match between Joe Perry and Robert Milkins had to be suspended after a man stormed The Crucible theatre in Sheffield, stood on the table and emptied a bag of the bright orange substance before being dragged away by security officials.
A woman also began climbing onto another snooker table, where Mark Allen was playing Fan Zhengyi, but was bundled away by tournament staff.
Watch: Just Stop Oil halt snooker match
A man and a woman were later arrested by South Yorkshire Police.
Milkins and Perry's game was abandoned and will resume at 7pm tonight, while Allen and Fan re-started after a 40-minute break.
The protesters both wore T-shirts apparently in support of the group of climate change activists Just Stop Oil, who subsequently posted online to claim responsibility for the disruption to the event.
After the conclusion of his 10-5 win over Fan, UK Champion Allen told BBC Sport: "I think I was the last person in the whole arena to work out what was going on because I was focused on the shot I was about to play.
"I heard a bang, that I thought it was on the other table and then I turned round and there was a woman on my table.
"It could have been a lot worse - you saw what happened on the other table and how much disruption it caused.
"It was a surreal moment but I feel like even talking about it is giving them airtime they don't deserve because they are just idiots. What are they trying to gain from what they have done? I am sure there are better ways to get their point across."