PAMELA SAMPSONBANGKOK (AP) â¿¿ World stock markets were mostly lower Wednesday as jittery investors awaited a deadline for Greece to get sufficient support from its private creditors for a debt reduction deal or face default. Benchmark oil rose above $105 per barrel while the dollar fell against the yen and the euro. The losses in stock markets came a day after Wall Street had its first big stumble of 2012 on Tuesday, with the Dow Jones industrial average dropping more than 203 points. The big concern among investors is a deadline Thursday for Greece's private bondholders to accept a deal to swap their Greek government bonds for replacements with a lower face value and interest rate. The swap is vital for Greece to cut its debt and get a bailout of euro130 billion ($172 billion) from other countries and the International Monetary Fund. Without the bailout, Greece could default on its debt later this month and rattle markets around the world. "Rumours that a slack participation rate by private investors in the Greek bond swap might force Athens to extend the deadline beyond Thursday are likely to keep investors at bay. The last thing markets want to see is uncertainty," Stan Shamu, market analyst at IG Markets in Melbourne, said in an email. A report showing that the combined economies of euro countries shrank at the end of 2011 and talk of war from Israel over Iran's nuclear program also weighed on investors' nerves. European stocks were mixed in early trading. Britain's FTSE 100 was marginally down at 5,762.73. Germany's DAX lost 0.2 percent to 6,619.91 and France's CAC-40 rose 0.1 percent to 3,366.10. Wall Street was headed for a higher opening, with Dow Jones industrial futures rising 0.2 percent to 12,775 while S&P 500 futures gaining 0.3 percent to 1,246.30.