A 17-year-old boy has been bailed until September 5 after being arrested on suspicion of possession with intent to supply a controlled drug.
His arrest follows the sudden death of Martha Fernback outside a community centre in South Oxfordshire.
More top news
Wednesday morning's weather for the east of the region
Wednesday morning's weather for the west of the region
The first of 1,400 new commuter train carriages for the south has just arrived from Germany.