Police officers secure the site of a suicide bomb attack in downtown Tunis. Picture: Zoubeir Souissi/Reuters

Tunis - Two people blew themselves up on Thursday in two back-to-back suicide attacks in the centre of the Tunisian capital, injuring at least nine people, the Tunisian Interior Ministry said.

The first bombing took place near a police patrol car in Charles de Gaulle Avenue in central Tunis, wounding three civilians and two policemen, the ministry added in a statement.

One of the two policemen died later of the injuries he had sustained in the attack, local media reported, citing a security official.

Four other security personnel were wounded in a second suicide attack that targeted a police building in the city shortly after, according to the ministry.

People are prevented from entering a secure area after an explosion in Tunis. Picture: Riadh Dridi/AP

The suicide bomber reportedly tried to storm the anti-terrorism building in the district of Gorjani, but was prevented by police, witnesses said.

So far, no group has claimed responsibility for the bombings.

A Tunisian police officer gestures near an explosion site in Tunis. Picture: Riadh Dridi/AP

In recent years, Tunisia has witnessed a string of militant attacks, most of them claimed by the Islamic State extremist group.

People wait behind barriers after an explosion in Tunis. Picture: Riadh Dridi/AP

In March 2015, 21 tourists and a policeman were killed when gunmen attacked the Bardo Museum in Tunis. 

Three months later, 38 tourists, mostly Britons, were killed in an attack at a hotel in the coastal city of Sousse. 

In November that year, a suicide bomber killed 12 members of the presidential guard in Tunis, promoting the government to impose a state of emergency.

A Tunisian soldier stands guard near the site of an explosion in Tunis. Picture: Riadh Dridi/AP