New York City ? Stocks plunged around the world Tuesday as fears spread that Europe’s attempt to contain Greece’s debt crisis would fail. The euro fell to its lowest point against the dollar in a year.

The Dow Jones industrial average lost 225 points, its biggest drop in three months. The slide erased a 143-point gain from Monday. The Dow and broader indexes each fell more than 2 percent. Meanwhile, Treasury prices rose on increased demand for safe investments.

Stocks have seesawed in the past week as European countries’ efforts to agree on a bailout package for Greece proceeded in fits and starts. An agreement finally came together over the weekend, but its ballooning size of $144 billion has investors worried that Europe would have an even tougher time assembling an aid package if a larger country such as Spain or Portugal were to get in trouble. Traders are concerned that problems in Greece and other countries could spill over to the rest of Europe and in turn, the U.S.