Meanwhile, the area has been cordoned off by the police and nearby schools have been shut, independent.com cited the local media as saying.
The Tunisian Ministry of the Interior confirmed that security forces are in a state of alert.
Security sources confirmed to Arabi21 that two terrorists detonated themselves on a motorbike near the United States embassy in Tunis.
"We heard a very powerful explosion ... we saw the remains of the terrorist lying on the ground after he went on the motorbike towards the police", said Amira, a shopkeeper.
Mechichi said five other Tunisian officers were injured in the attack, as well as a Tunisian female citizen.
The blast occurred on Friday morning near the U.S. embassy in Tunis, apparently targeting a police checkpoint on a street leading to an worldwide airport.
An explosion rocked the Berges du Lac district where the embassy is located around midday, causing panic among pedestrians and motorists in the area.
Later in the day, Tunisian President Kais Saied visited the injured in a hospital near capital Tunis.
Since its 2011 revolution, Tunisia has witnessed a string of jihadist attacks that have killed dozens of security personnel, civilians and foreign tourists. Assaults on security forces have persisted, mainly in remote areas along the border with Algeria.
In June, last year, the Islamic States took the responsibility for two simultaneous terrorist attacks that were carried out in Tunisian capital.
Security forces killed four people during the attack in which the American flag was torn down and replaced with an Islamic flag. The nation has experienced several serious terror attacks since the Arab Spring, including the 2015 gun attack on the resort town of Sousse that left 38 people dead.
Camera IconSecurity personnel stand outside the U.S. embassy in Tunis, Tunisia.
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