Voters in Portugal are returning to the polls for a third general election in three years, as the country’s increasingly fragmented political landscape defies efforts to unite behind policies on pressing national issues such as immigration,

By Catarina Demony and Sergio Goncalves LISBON (Reuters) -Portuguese voters went to the polls on Sunday for a third parliamentary election in as many years, facing the prospect of more uncertainty from a vote viewed as unlikely to deliver a stable government.