Arsenal have condemned the "dangerous and totally unacceptable behaviour" of a 21-year-old man who has been arrested for shining a laser in the face of Chelsea winger Mykhailo Mudryk.
The Met Police confirmed the man is in police custody after being arrested during the Gunners' 3-1 win at Emirates Stadium on Tuesday.
A green light was visible on Ukraine international Mudryk's face after he came on as a 71st-minute substitute.
He later said on Instagram: "It's ok."
Arsenal said: "This behaviour is dangerous and totally unacceptable, and we will fully support the police with their enquiries.
"We will obviously take the strongest possible action."
Mudryk joined Chelsea from Shakhtar Donetsk in January in a deal worth up to £89m, but has yet to score for the club in 14 appearances.
