Suleiman Sule, the senator’s aide, said some supporters of the lawmaker were meeting at the campaign office on Saturday when armed men invaded the property.
There were immediate reports of casualties.
“Police officers have already cordoned the office area,” Mr. Sule told newsmen.
Residents of the area said the attackers came in large numbers.
“They were all with dangerous weapons and all headed across the road where Shehu Sani’s office was. They dispersed some people who were holding meeting in the office,” one resident said.”Thank God it is a busy area and there is always the presence of police officers. Before it could get out of hand they thugs ran away.”
Mr. Sani has been enmeshed in a running political battle with Governor Nasir El-Rufai of Kaduna State.
Last week, a faction of the party loyal to the governor announced the indefinite suspension of the Senator.
Mr. Sani fought back calling the governor a “dubious progressive”.