They are the armies of the night, well, OK, the armies of the afternoon when school lets out

Cambridge Police report on a rumble in Porter Square around 3:15 p.m. on Tuesday:

Witness reports seeing one group of youths exit an MBTA bus, another exit the Porter Square T Station, and a third walking up Upland Road meet at the corner of Mass Ave & Upland. An argument started and a fight ensued. The people involved were males ages 15-17. They appeared to be groups from the Walden Square/Lincoln Way area and the Cambridgeport/Area 4 area. One of the groups of youths identified themselves as a gang member.