The United Nations reports that the Eritrean government has expelled U.S., European, Russian and Canadian staff of the U.N. Peacekeeping force that monitors the nation's border with Ethiopia.

U.N. officials said Wednesday that they received a letter from Eritrean leaders saying the U.N. staff members have 10 days from receipt of the message to leave the nation. The letter was dated Tuesday. No explanation for the expulsion was given.

The U.N. Security Council passed a resolution last month that threatens sanctions against both Eritrea and Ethiopia if they use force to settle their border dispute. Eritrea rejected the measure, on the grounds it would not penalize Ethiopia for refusing to accept international demarcation of the border.

The countries fought a border war from 1998 to 2000 that killed 70,000 people.

Some information for this report provided by AP and AFP.