Oil prices ease in Asian trade
Analysts said the markets remained fragile despite growing hopes of a US-led global economic recovery.
New York's main futures contract, light sweet crude for delivery in August, fell 44 cents to 61.58 dollars a barrel.
Brent North Sea crude for September delivery shed 71 cents to 63.30 dollars. The August contract expired on Thursday.
Analysts said the markets remained fragile despite growing hopes of a US-led global economic recovery.
"Things are looking better, but the markets are still looking shaky," said Ben Westmore, a minerals and energy economist with the National Australia Bank.
He said the oil market was taking "two steps forward, one step back" as traders are more prone to engage in profit-taking whenever prices shoot higher.
"When you get a price increase, there will be investors thinking that it will be a good time to sell off and that's what's happening," he said.
Other analysts noted that overall crude demand worldwide remained weak and supplies were plentiful.
"Oil demand still remains weak and a large amount of uncertainty still remains over the timing and rate of global economic recovery," said oil analyst Nimit Khamar at the Sucden brokerage in London.
French banking group Societe Generale said while company earnings have been the focus during the week, "it seems only the good, or more accurately, the less-worse are getting airtime."
It noted that "outright weak numbers from companies like Nokia are pushed to the sidelines."
The Finnish telecom giant reported a 66.0-percent collapse in quarterly net profit to 380 million euros (535 million dollars) on Thursday because of a drop in handset sales and weak prices.
The company's share of the worldwide handset market fell to 38 percent, down from 40 percent 12 months earlier, the company said.
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