SOFIA - Two workers were killed on Monday following a blast at private weapons producer Arsenal in central Bulgaria, the interior ministry said."Two workers have died, there are no data for other injured people and there is no danger of a follow-up blasts," it said in a statement.The ministry said the accident occurred during repair work in one of the buildings of the country's biggest weapons maker. The blast triggered a fire that was quickly put out, the interior ministry said.Police have cordoned off the building and will be investigating the reason for the blast.