In mid-September 2018 the Swiss press reported that two men allegedly working for the GRU had been arrested in The Hague, the Netherlands in the spring that year, after the Salisbury poisoning incident, for planning to hack the computer systems of the Spiez Laboratory, a Swiss institute analyzing chemical weapon attacks for the Organisation for the Prohibition of Chemical Weapons (OPCW). In early October 2018, the government of the Netherlands announced they had arrested four GRU operatives on 13 April: Aleksei Morenets, Evgenii Serebriakov, Oleg Sotnikov, and Aleksey Minin. The Russians allegedly attempted to launch a major "close access" cyberattack against the headquarters of the OPCW in the Hague and also intended to travel onwards to the Spiez laboratory in Switzerland, which was testing Novichok samples from Salisbury at the time. Investigation conducted by open-source intelligence outlets in the aftermath of the Dutch government's revelations that used Russian road police databases led to identification of further 305 GRU officers whose private cars were registered at GRU headquarters in Moscow. GRU officer Denis Vyacheslavovich Sergeev has also been documented as operating in Geneva and Lausanne.