From 1980 to 1983, a bloody war raged in and around Naples, which left several hundred dead and severely weakened the NCO. It had its root causes in two main events: the rapid growth of two distinct types of Camorra gangs and the profound political and financial instability created by the November 1980 earthquake. The war soon became a straightforward battle for power which was fueled by the billions pouring in from Rome for earthquake reconstruction. For instance, the highest number of deaths occurred in the 1981–82 period, when most of the reconstruction contracts were being assigned. The number of gangland murders soon grew to epic proportions. During this period, some Neapolitans would place illegal and macabre bets, in a system controlled by the Camorra itself, on whether there would be more gangland murders than days over the coming year. Between 16 and 19 June 1983, police arrested a thousand members of the NCO.