Six officials of Chinese megabank ICBC have been placed in detention by Spanish authorities on suspicion of laundering tens of millions of euros, judicial sources said on Saturday.

They were detained overnight and while three of them can be freed if they post bail of 100,000 euros ($111,000) each, the others will remain in custody for the time being, the Madrid appeals court said.

Egypt's President Abdel Fattah al-Sisi opened on Saturday an economic summit attended by African leaders and businessmen that aims to boost trade and investment across the continent.

More than 1,200 delegates including some heads of state will negotiate business agreements for the next two days at the Red Sea resort of Sharm el-Sheikh, to attract private sector investments in Africa.

The euro pushed higher against the dollar Friday as European leaders reached a deal that could keep Britain in the European Union, avoiding a much-feared "Brexit."

Early in the day the dollar was ahead, after U.S. consumer price data for January signaled a pickup in inflation that would support the Federal Reserve sticking to its plan to tighten monetary policy with higher interest rates over this year.

Argentina's quest to resolve its debt problems moved a step forward Friday when a U.S. judge tentatively agreed to lift a block on repaying holders of its restructured bonds.

Judge Thomas Griesa, who placed the injunction on the payments two years ago to force Buenos Aires to settle with so-called holdout creditors, said the country's new reformist government had made enough progress for it to be lifted.

Germany doubled its arms exports last year to around eight billion euros ($8.9 billion), government figures showed on Friday, in contradiction to Berlin's pledge to rein in the amount of weapons Europe's biggest economy sells abroad. 

The increase was driven largely by "special factors," Economy Minister Sigmar Gabriel explained when presenting the data.

Oil prices fell in Asia Friday after a sharp rise in U.S. crude stockpiles and Saudi Arabia's rejection of proposed output cuts shot down a rally by the battered commodity.

The about-turn came as the U.S. Energy Department reported a 2.1 million barrel increase in U.S. commercial crude inventories, to the highest in more than eight decades, as well as sizeable increases in gasoline and other refined products.

U.S. aircraft maker Boeing said Friday it had won a $440 million deal with Papua New Guinea's flag carrier Air Niugini for four 737 MAX 8 planes.

Announcing the deal along with Boeing at the final trade day of the Singapore Airshow, Air Niugini chairman Sir Frederick Reiher said the carrier needed the planes "urgently".

The growing pain of plunging oil prices has galvanized Saudi Arabia to look beyond its rivalry with Russia and Iran over regional conflicts and pursue cooperation on production, analysts say.

But there are doubts about whether it will last because mutual suspicions remain deep and the Sunni-ruled Gulf kingdoms are loath to cede market share to Shiite Iran as it emerges from years of sanctions.

Saudi Arabia is "not prepared" to cut oil production, its foreign minister said on Thursday, after the top exporter agreed with Russia to freeze output if major rivals follow.

"If other producers want to limit or agree to a freeze in terms of additional production that may have an impact on the market but Saudi Arabia is not prepared to cut production," Adel al-Jubeir told AFP.

Niger, which holds elections on Sunday, is an arid uranium-rich nation south of the Sahara that faces repeated famines.

President Mahamadou Issoufou, who was elected in 2011, is running for a fresh mandate against 14 candidates.