One of the officers has been taken to hospital with a neck injury
Two policemen have been stabbed outside Tunisia's parliament building.
A suspected terrorist has been arrested in Tunis, according to the country's interior ministry.
One of the officers has been taken to hospital with a neck injury - the other wasn't badly hurt.
The interior ministry statement said the attacker was known to authorities, adding that he told investigators that he considers police to be tyrants.
The attack took place close to the Bardo Museum – where 21 people were killed in an attack in March 2015.
That same year three Irish people were among the 38 tourists murdered at the Sousse beach resort on the country’s east coast.
Security has been boosted at strategic sites in the years since with authorities reportedly dismantling dozens of terror cells.