A subsequent decision was for a British-made firearm, the Webley & Scott .32 calibre MP semi-automatic pistol. These changes had not been implemented by the end of December 1910, when a group of Latvian revolutionaries undertook an attempted break-in at a jewellery shop, which led to the Siege of Sidney Street. That event led to the murder of three policemen, the wounding of two others and a gun battle which involved the military being deployed in London.[66] A further review after the Sidney Street murders resulted in the Metropolitan Police replacing the Webley revolver with the Webley & Scott .32 calibre MP semi-automatic pistol in 1911; the City of London Police adopted the same weapon in 1912.[67]