Fire crews are at the scene of a large fire on land near the Metro Radio Arena, close to the centre of Newcastle.
Details of what caught alight are presently unclear, but thick black smoke could be seen from miles away.
One eyewitness said flames had spread to surrounding trees and vegetation.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.