In Peru, the government has imposed martial law, suspending civil liberties as it seeks to quell protests over a copper mine project in the southern region of Arequipa. Three protesters and one police officer have been killed as authorities cracked down on months-long protests which have successfully brought the Tia Maria mine project to a halt. Farmers and other residents say the mine will pollute their land and water. Meanwhile in another part of Peru, a protester has been killed amid a week-long strike by workers at a Chinese-operated iron mine. The union says Luis Quispe was shot dead by police.