A fire involving about 2,000 hay bales could have been started by a firework, police have said.

The blaze, at a farm near Witney, broke out on Tuesday night and remained alight until Wednesday lunchtime.

Four fire crews were called to the Bushey Ground farm near Minster Lovell and monitored the blaze until it burnt out.

Thames Valley Police said it was treating the incident as a suspected arson attack.

Anyone who may have seen anything suspicious at the farm between 5pm and 6pm on Tuesday should contact police on 101.