Doctors rush a wounded man into Black Lion Hospital in Addis Ababa after clashes between opposition supporters and police

Three straight days of clashes between Ethiopian police and demonstrators in the capital, Addis Ababa, have left at least 42 people dead and more than 150 wounded.

In the latest unrest Thursday, doctors say at least three people were killed and at least eight injured, as police battled demonstrators in several parts of the city.

Opposition supporters have been protesting last May's elections, alleging massive fraud.

Authorities have arrested scores of demonstrators and some opposition leaders, including the head of the main opposition party, the Coalition for Unity and Democracy. The government has accused opposition leaders of inciting the violence.

The U.S. State Department has called on both sides to show restraint, and it urged the opposition to refrain from inciting civil disobedience. It also called on Ethiopia's government to create an independent commission to investigate the demonstrations.

Britain has warned its citizens against traveling to Ethiopia.