At least three have been reportedly killed and 33 injured in two separate suicide attacks in the Ugandan capital, Kampala, on Tuesday morning.

According to police spokesperson; Fred Enanga who spoke to reporters at a news conference in the city, he said two civilians and a police officer were killed in the blasts adding that three suicide attackers also died.

Enanga said police were yet to determine the total number of victims as a team of forensic experts was still documenting the scene.

Two explosions shook the city center within five minutes of each other. Police said CCTV footage showed an adult male detonating himself while carrying a bag near the central police station at 10:03 am local time. Enanga said the attacker died instantly.

Two people have been confirmed dead at the scene of the first blast, while 17 others sustained critical injuries, Enanga said in a statement.

Three minutes after the first explosion, two suicide bombers on motorcycles were seen detonating themselves near Raja Chambers and Jubilee Insurance Building along the central Kampala Parliament Avenue, Enanga said. The two bombers died and the body of a civilian was also found at the site, he added.

Enanga said 33 people were injured in the two explosions; Five of them are in critical condition. The injured are being treated at the Mulgo National Referral Hospital.

Police pursued a fourth bomber, Enanga said, adding that two further bombs were recovered from his home that will be detonated safely.

Ugandan state minister Kabbyanga Godfrey Baluku Kiime tweeted about the explosion, saying: “There has been a bomb blast at the headquarters of [the Ministry of Information and Communications Technology and National Guidance]. All of us are safe. A few colleagues were hurt by flying window glasses and debris.”

Enanga said the attacks bore the hallmarks of the Allied Democratic Forces (ADF), an Islamist rebel group.

He urged members of the public to remain vigilant, warning that: “the bomb threats are still active, especially from suicide attackers.”

Traffic in Kampala has been severely restricted following the explosions, with authorities urging the public to close businesses and leave the area.

Police and army personnel cordoned off streets around the blast site and several ambulances were deployed. Images on social media showed several people lying on the streets near the entrance of Central Police Station and Kampala’s High Court.

At Parliamentary Avenue, where the second explosion occurred, all streets have been cordoned off by security, with legislators and parliamentary staff evacuated.

Last month, an explosion in Kampala killed at least one person and injured several others. Reuters reported that the Islamic State had claimed responsibility for that blast.