Foreign investors’ demand for U.S. government bonds is rising amid the European fiscal crisis.

The U.S. Department of the Treasury says that foreigners’ holdings of U.S. bonds jumped zero-point-three percent to reach an all-time high of more than five-point-one trillion dollars in March. The amount of U.S. Treasury holdings held by foreign investors has been rising for the past eight months.

The surge is attributable to global investors’ pursuit of safe investments, such as U.S. state bonds, with the spread of the euro zone crisis.