The Instro Precision base at Discovery Park in Sandwich has shut down for the day after a number of protesters got on to the site.
East Kent Campaign Against the Arms Trade protesters claim the company supplies Israel with weapons to kill Palestinian people in Gaza.
Instro Precision says it is a supplier and system integrator of support equipment for military and commercial electro-optical sensors in the world.
The firm moved to Discovery Park from Broadstairs where it had been the target of numerous protests.
“Elbit Profits from Israeli War Crimes.” #StopArmingIsrael #WarCrimes pic.twitter.com/ExnIjmP1Sp
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Police are still at the scene. No arrests have been made.
A Kent P{olice spokesman said: “Kent Police was called at 7.42am to reports of a protest at a business in Discovery Park, Ramsgate Road, Sandwich.
“Officers attended and remain at the scene.”