FIRE investigators are today looking through CCTV to discover what started the blaze at the Grundon waste depot in Ewelme.
About 75 firefighters - including crews from Banbury, Berkshire and Banbury - tackled the blaze at the depot in Goulds Grove for almost six hours last night.
Incident commander Nigel Wilson said it was not yet caused the fire, nor exactly where it started.
However, it is understood the fire started outside and then spread to a sorting building.
It was in an area where hazardous chemicals are stored and a plume of smoke rose high over the site, sparking a warning to people living up to 10 miles away to close their doors and windows.
Mr Wilson said: "It was a fairly substantial fire.
"I would not like to speculate on the cause. Investigators have got CCTV of the entire site and at some point today will establish where the fire started and what caused it."
Firefighters were alerted at about 7.20pm and Mr Wilson said: "The fire was brought under control at about 1am and we had a position where I was comfortable we had put it out by about 3am."
Mr Wilson expected firefighters would leave the depot at some point today.
Reader video from Lu Anthony
A 200-metre safety cordon was put around the depot during the fire.
Reader video from Mark Goldie
- Photos from reader Lu Anthony
Our top stories:
8:30am Saturday 29th August 2015
A TOP transplant surgeon has backed the Oxford Mail organ donation campaign saying more donors are needed than ever before.
9:00am Saturday 29th August 2015
A RAPIST who disappeared before his trial to escape justice is believed to have had a second passport he could have used to flee the country.
8:00am Saturday 29th August 2015
MOVING tributes were paid to Carole Roberts yesterday at the former Lord Mayor of Oxford’s funeral.
7:00am Saturday 29th August 2015
SEVEN men have appeared in court accused of a catalogue of sex offences against children including raping underage girls.
6:30am Saturday 29th August 2015
PLANS for an Oxford Garden City could return as the Vale looks to accommodate 4,000 new homes.
6:00am Saturday 29th August 2015
FULL plans have been revealed for 140 new homes in Littlemore near Heyford Hill Sainsbury’s.