Police have revealed why a controlled explosion had to be carried out on an old industrial estate in Uxbridge .
Multiple specialist vehicles were sent to the scene of what may have simply been a discovery of a tin of paint.
Emergency services were called to the scene of the old Trimite Site, on Ashley Road, off Cowley Mill Road, just after 10am on Wednesday (May 11), when chemicals were found after they disturbed during building work.
Anyone within 100m of the site was evacuated ahead of the explosion, which is likely to have been heard throughout the surrounding area.
A Metropolitan Police spokesperson said: "The premises were evacuated and cordon's put in place while the emergency services dealt with the incident.
"Specialist officers attended the scene and a controlled explosion was carried out."
The 'dangerous substance' was found when contractors were clearing out the building at Arundel Road and believed it to be highly explosive and more than 20 years old.
The substance was found in a labelled tin, and initially police were concerned it was highly volatile picric acid - an explosive substance sometimes used in medicine and dyes.
But, after the explosion did not produce the reaction they were expecting, it is now doubtful this was the case, and one person evacuated from the area commented on the original getwestlondon story: "All for a tin of paint!! Was there, was evacuated and there was a controlled explosion!"
A police spokesperson could not confirm this, however, adding: "The remains of the substance following the controlled explosion has been sent off for analysis."