text: Oil Back Over \$50, Market Eyes Nigeria  NEW YORK (Reuters) - Oil prices pierced the \$50-a-barrel  mark again on Friday amid concern over possible conflict in  Nigeria's oil-producing delta region, where a two-day truce  between rebel militia and government forces is holding.
inputs: Oil Back Over \$50, Market Eyes Nigeria  NEW YORK (Reuters) - Oil prices pierced the \$50-a-barrel  mark again on Friday amid concern over possible conflict in  Nigeria's oil-producing delta region, where a two-day truce  between rebel militia and government forces is holding.