An attack on pipeline infrastructure in Nigeria and the forced closure of a pipeline to a U.K. refinery have helped push the price of oil to nearly $120, yet another “pscyological” milestone.

Electronically traded oil futures rose to $119.92 on Monday on the Nymex exchange on the first business day after the Movement for the Emancipation of the Niger Delta, a lightly armed Nigerian insurgency group, confirmed their responsibility for attacks which hit Shell and ExxonMobil production in the volatile West African country.

A strike by managers and office staff had caused disruption earlier in the week.

Yet, oil was down by mid-morning Monday in London to $119.08, Bloomberg reported.

And on Monday, BP confirmed it had shut-down the Forties Pipeline system carrying over 700,000 barrels of oil per day to the United Kingdom ahead of a two-day strike by Scottish workers at Grangemouth refinery.

The Associated Press reported refinery owner Ineos plans to to deny a “generous” pension scheme, a move which appears to have provoked the strike.