A teenager who was arrested following the incident where Northern Ireland's West Brom midfielder Chris Brunt was struck in the face by a coin will face no further action.
Thames Valley Police made an arrest in February after Northern Ireland international Brunt, 31, suffered a cut under his left eye when he approached the stand housing Baggies supporters following a 3-1 loss to Reading in the FA Cup.
The force have now said a 17-year-old has been given a caution in relation to the matter at the Madejski Stadium and will take no further action.
In a statement a spokesperson for Thames Valley Police stated: "A 17-year-old boy from Shropshire was given a youth caution for using threatening/abusive words/behaviour or disorderly behaviour likely to cause harassment/alarm or distress.
"No further action was taken in relation to the offence of throwing a missile on to a football playing area."
The FA had also launched an investigation into the incident against Brunt, who called the act "absolutely disgusting".
