Dozens of people have demonstrated outside the Canadian embassy in Mexico City against the killing of an anti-mining activist. The protesters blame the death of Mariano Abarca on a Canadian-owned mining company, Blackfire Exploration Ltd , which is operating in the southern Chiapas…He had long opposed Blackfire's mining in the region, saying that the company's activities had contaminated local rivers and caused the death of local crops and livestock…Blackfire has denied the company had any involvement in Abarca's death. A company spokesman said Blackfire had asked the Canadian Embassy in Mexico to intervene after receiving allegations that their employees in Chiapas were being attacked and beaten in response to the killing.