The Islamic Movement of Nigeria members- Shiite on Tuesday invaded the National Assembly Complex throwing stones and injuring three policemen.
The invaders stormed the complex at about 1.30 p.m., demanding the release of their leader Ibrahim El Zakzaky who has been in detention for about four years.
The News Agency of Nigeria (NAN) reports that injured policemen were rushed to the NASS clinic for treatment.
The protesters forced their way through the first gate near the Federal Secretariat and headed to the main building where they clashed with security operatives.
NAN also reports that plenary is still going on at the House of Representatives.
Additional policemen are also being deployed in strategic locations to forestall total breakdown of law and order in the complex.