Fire heavily damaged an apartment in Mohegan Lake Tuesday, just a few months after officials ruled another fire at that location was deliberately set.The building is one of several in a complex on East Main Street near the Cortlandt Town Center. The Lake Mohegan Fire Department was able to confine most of the damage to one of two apartments in the building. No one was injured and the cause of the fire remains under investigation.An arson fire heavily damaged several apartments at the same complex in October. In that case, the tenant said someone poured a flammable liquid on his door and set it on fire. Tuesday?s fire is not believed to be connected to that blaze.