U.S. stocks finished lower on Monday, with all three indexes falling almost 1 percent, as investors worried that Spain may need more funds to aid their financial crisis. Eurozone finance ministers finalized initial monetary aid fund terms for Spanish banks last week, but investors feared that may not be enough. Spain's regional economies are also showing signs of struggle, with Valencia said to have requested emergency funding last Friday. In world markets, European stocks ended lower, with the declines led by the DAX in Germany plunging 3.2 percent. Asian markets also ended lower, with the declines led by the Hang Seng in Hong Kong falling 3 percent. In U.S. company news, McDonald's shares fell after the fast-food restaurant missed earnings and revenue expectations, citing a slowing global economy. Meanwhile, Halliburton Company shares rose after the oil and natural gas services company posted better-than-expected earnings as strong drilling activity in international markets offset a slowdown in North America. The U.S. dollar rose against the euro and fell against the yen. Light sweet crude oil for August delivery fell $3.10 to $88.34 a barrel on the New York Mercantile Exchange. Gold futures fell $6 to $1,576.80 an ounce. The Dow Jones industrial average fell 101.11, or 0.8 percent, to 12,721.46. The broader Standard & Poor's 500 index fell 12.14, or 0.9 percent, to 1,350.52. The technology-heavy Nasdaq composite index fell 35.15, or 1.2 percent, to 2,890.15.