The benchmark contract rallied 3.80 dollars to close at 116.32 on Friday at the New York Mercantile Exchange.
Brent North Sea crude for June was 15 cents higher at 114.71. The contract jumped 4.06 dollars to settle at 114.56 on Friday in London.
Nigerian militants attacked an oil ship off the coast of the west African country and took two people hostage, a military spokesman was quoted by AFP as saying Sunday.
The incident came after Niger Delta militants attacked facilities belonging to Anglo-Dutch oil group Shell in southern Nigeria, leading to a cut in output, company and security sources said.
Shell, which accounts for around half of Nigeria's 2.1 million barrels per day output, has been forced to cut production because of an upsurge in militant attacks on its facilities.
Oil rallied close to a record 120 dollars a barrel last week on supply concerns linked to work-stoppages at a Scottish refinery and in Nigeria.
With the strikes resolved, crude prices were largely driven by movement in the US dollar, according to analysts.
News that the US economy shed 20,000 jobs in April, far fewer than the 75,000 expected by the market, helped lift sentiment on Friday.
The unemployment rate unexpectedly slipped a tenth of a percentage point to 5.0 percent, the US Labor Department said, compared with an expected rise to 5.2 percent.
