Police, however, said these weapons were not used in the murders during the clash and search for them was still on.
Other items seized from the prison yesterday included seven memory cards, mobile batteries, sim cards, lighters, electric heaters, mobile chargers, electric wire and chilli powder, police said.
A case has been registered at the Barke police station.
Notorious criminal Madoor Isubu and his associate Ganesh Shetty were murdered inside the prison by their rival gang and police suspect that the attack was pre-planned.