The fire was reported at 4.30pm at a derelict school in Thorne Rd, Rowley Regis - one male has been arrested in connection with the incident
Road closures are in place in Thorne Rd, Shelsey Ave, Portway Hill, Newbury Lane and Stuarts Rd while the incident is dealt with
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The 37-year-old was helping authorities in the country track the criminals when his aircraft was fired upon in January.
Labour strongholds tended to remain so - apart from a major loss for the party in Dudley.
Labour suffered losses in English council elections, but the initial results were not as bad as many had expected.