Brazil to auction coveted Libra oilfield Some 200 employees of the Brazilian state oil giant Petrobras demonstrated outside the company headquarters Thursday to demand the suspension of Monday's planned auction of pre-salt oil concessions for the giant Libra oilfield. The demonstrators are angry at concessions worth billions of dollars being offered to private and foreign companies. Fishermen worried about the effect on fish stocks of drilling in the region also joined the protest. Images and soundbites