Northumbria Police say further arrests are expected following a shooting outside a pub on Tyneside.
A 54-year-old man was shot in the car park of The Six Mile Bridge Inn in Seaton Burn on Friday afternoon.
Eight people have been arrested so far, as part of the investigation.
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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.