a duffel bag containing human remains was found on loughery way in cambridge , massachusetts .
the person , who will not be identified until their arraignment on monday , was taken into custody after the bag was found on loughery way in cambridge on saturday morning .
it comes as additional human remains have been found in the common area of an apartment complex on 6th street , police said .
the building was quickly cordoned off , and more than a dozen investigators were seen examining the site throughout the day .