A tense situation had arisen at the CEYPETCO, Dematagoda after Arjuna Ranatunga entered the premises, reports say.
According to police, two persons injured have been hospitalised.
Reports say that Mr.Ranatunga's security personell have fired their weapons after an attempted assault on Mr. Ranatunga at the premises.
Mr. Ranatunga was functioning as the ministry of Petroleum until the political changes on Friday night unfolded.
(Previous update : 04.40pm Oct. 28, 2018)