A Palestine Action camp outside Elbit's drone engine factory in Shenstone,Staffs. The group claims that Instro Precision is owned by Elbit

The activists break into the factory in Kent

The Scotiabank building in Bishopsgate in the City of London was sprayed with red paint and activists blocked doors at 6am on Monday.

Det Chief Insp Paul Doyle said: “We arrested 10 protesters linked to Palestine Action.

“Criminal damage of businesses and institutions in the City of London will not be tolerated and will result in police action.”

Palestine Action claims that Scotiabank’s subsidiary fund 1832 Asset Management holds shares in the Israeli arms company Elbit.

It also claims that Instro Precision is owned by Elbit and produces military-grade electro-optical equipment used by Israel.

Scotiabank did not comment. Instro Precision has been approached for comment.