Firefighters are tackling a fire at the Kasubi Tombs site where four Ugandan regional kings are buried.
It is an important cultural heritage site in Uganda.
The cause of the fire has not yet been confirmed.
In 2010, a fire gutted the same site sparking outrage as thousands protested in the capital Uganda.
Demonstrators claimed it was a deliberate arson attack because of territorial differences that existed at the time between the historical kingdom and the government.