Two explosions hit the centre of the Ugandan capital Kampala.
One blast took place near parliament, with the other going off close to the city’s police headquarters.
There are fears people may have been killed or injured in the explosions. A reporter for NTV Uganda said he saw pieces of flesh scattered in the road.
The cause of the blast was not immediately clear but the Ugandan authorities have blamed previous bombings on Islamist militants.
Ugandan forces are part of an African Union peacekeeping force in Somalia fighting al- Shabab, an insurgent group allied to al-Qaeda.
Last month, the Islamic State group said it was behind an attack on a bar in Kampala which killed a 20-year-old waitress.
Proceedings in parliament have been called off and lawmakers advised not to come to the building following Tuesday’s blast.
The United States (US) embassy in Kampala, Uganda had warned of “the ongoing possibility of more terrorist attacks in Uganda”, three weeks ago.
This was contained in a security alert dated October 26.
The alert was issued after two other explosions in Kampala, one of which a militant group said it had carried out.
The embassy warned US citizens at the time to “remain vigilant and aware of your surroundings while travelling in Uganda”.—BBC