BRUSSELS (Reuters) - European Union (EU) nations banking on 5G to boost economic growth are eager to tackle conspiracy theories linking the wireless technology to the spread of the novel coronavirus that have seen masts torched in several places.According to telecoms lobbying groups ETNO and GSMA, such false claims have resulted in over 140 arson attacks on infrastructure such as mobile phone masts in 10 European countries and assaults on scores of maintenance workers.Britain has seen 87 arson..