UPDATE: Apparently the trouble started in the early hours of the morning and has been going on ever since. “War Zone” is the phrase being used most often by locals. This link to a 1:43 min amateur video by a local gives a good idea of the chaos (and the noise).
UPDATE 2: Details starting to emerge. Apparently it all kicked off when local drugs gangs staged an early morning attack on a key underpass to the zone as part of a territorial dispute, police responded and the fun has been rolling on ever since.