The Inspector General of Police, Mohammed Adamu on Wednesday visited injured police officers at the National Hospital in Abuja.
The officers were injured during the invasion of the National Assembly by members of the Islamic Movement of Nigeria loyal to Ibrahim El-Zakzaky on Tuesday.
During the visit, the IGP said 40 Shiites involved in the invasion have been arrested and the five police officers receiving treatment at the trauma center of the National Hospital are getting better.
He added that all their medical bills will be paid for by the police force, adding that investigations are still ongoing into the incident and perpetrators of violence will be brought to book.
Shiite protesters had earlier stormed the parliament building demanding the release of their leader, El-Zakzaky.
They were denied entrance at the second gate, after gaining access through the front gate by the three arms zone.
Vehicles were destroyed and burnt, while nine officers sustained injuries to the head and leg when the protesters attacked them.