Sunderland have announced an arrest has been made after a plastic bottle was thrown at a Sheffield United player in Saturday's Championship game.
The Wearside club launched an investigation following their 2-1 defeat by the Blades after video footage showed United goal scorer Clayton Donaldson apparently being hit by an object thrown from the South Stand at the Stadium of Light.
A club spokesman said: "Using video footage, an individual has been identified and subsequently arrested after a plastic bottle was thrown during the recent game against Sheffield United at the Stadium of Light.
"Affording a safe and welcoming environment to everyone who attends games is paramount and our club will always have zero tolerance to any behaviour that negatively impacts on the safety of those in our care.