World oil prices continued lower in Asian trade on Friday after the US dollar strengthened to its highest level since late March.
New York's main oil futures contract, light sweet crude for June delivery, slipped 57 cents to $111.95 per barrel.
The benchmark contract dropped 94 cents to close at $112.52 per barrel yesterday at the New York Mercantile Exchange.
Prices have eased since striking a record high of $119.93 in New York last Monday during a Scottish refinery strike and related pipeline closure.
Brent North Sea crude for June delivery fell 35 cents to $110.15 a barrel, after settling at $110.50 yesterday in London. The contract hit an all-time peak of $117.56 on April 25th.
The US currency fell to a record low of $1.6019 to the euro on April 22 but has since recovered, changing hands at $1.5471 in Asian trade on Friday after shooting as high as $1.5437 on Thursday.
It was the dollar's strongest showing since March 25th.
A stronger US currency makes dollar-priced crude more expensive for foreign buyers and tends to dampen demand.
Analysts said the dollar strengthened following a better-than-expected reading on US manufacturing activity and growing speculation that US interest rates will stabilise.
Agencies