Markets fall after Greece's credit rating downgraded

After rallying for most of Monday, U.S. stocks fell following a downgrade of Greece's credit rating amid concerns over debt-riddled European Union countries. 

The Dow Jones industrials were off 20.18 points — 0.2 percent — to 10,190.89 after gaining 118 points before Moody's Investors Service downgraded Greece's credit rating by four notches to junk status today. 

BP stock continued its fall, dropping 9.7 percent to $30.67 as President Barack Obama and congressional lawmakers put pressure on the company to set up an escrow account to deal with the damaging effects of the oil spill in the Gulf of Mexico. 

Senate Democrats sent a letter to Hayward on Monday asking for the creation of a $20 billion escrow fund to ensure there is enough money to pay for the damage caused by the oil spill. 

The company's board met today to discuss a planned dividend but no information was expected out of those meetings until Wednesday, when BP CEO Tony Hayward and Carl-Henric Svanberg, BP's chairman of the board, are scheduled to meet with Obama at the White House. 

Hayward will testify on Capitol Hill before several committees on Thursday. 

Obama made his fourth visit to the Gulf Coast on Monday and will address the nation from the Oval Office on Tuesday night.