Anti-war protesters locked and superglued themselves to the entrances of a weapons factory in Brighton.
The protest - to mark the fifth anniversary of the Iraq war - took place outside EDO MBM Defence Systems.
Campaign group Smash EDO said some of the demonstrators used arm tubes and bicycle locks to attach themselves.
Sussex Police said six were arrested for aggravated trespass, and one was detained for criminal damage. No-one from EDO MBM was available for comment.
'Protesters cut free'
EDO designs, develops and manufactures weapon carriage and release systems and is an approved supplier to the Ministry of Defence and governments worldwide.
Campaign group spokesman Andrew Beckett said: "Our message is that EDO MBM were complicit in war crimes committed in Iraq through the manufacture of vital components used in aerial bombardments."
Protester Tom Hayes, 29, said the conflict "certainly hasn't benefited the people of Iraq, who will have been left completely traumatised".
He said the protesters were cut free from the entrances in Home Farm Road by firefighters using pneumatic cutters.
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