TEL AVIV (Reuters) - Hackers have broken into the systems of more than a dozen global telecoms companies and taken large amounts of personal and corporate data, researchers from a cyber security company said on Tuesday, identifying links to previous Chinese cyber-espionage campaigns. Investigators at U.S.-Israeli cyber security firm Cybereason said the attackers compromised companies in more than 30 countries and aimed to gather information on individuals in government, law-enforcement and politics. The hackers also used tools linked to other attacks attributed to Beijing by the United States and its Western allies, said Lior Div, chief executive of Cybereason. Cybereason declined to name the companies affected or the countries they operate in, but people familiar with Chinese hacking operations said Beijing was increasingly targeting telcos in Western Europe. Western countries have moved to call out Beijing for its actions in cyberspace, warning that Chinese hackers have compromised companies and government agencies around the world to steal valuable commercial secrets and personal data for espionage purposes.