Same building neighbour confirms loud bangs

Just spoken with our same building neighbour. They were also awoken by the loud bangs. They saw flashes of light accompanying the bangs. They suspect it was firecrackers. Obviously firecrackers are better than gunshots but it still is not on to be setting them off at 4:20am. Our downstairs neighbour confirmed it was from next door because they could see them being set off.

They complained to Brent Council about it and the person they were speaking to in the housing office was also woken by the same noisy bangs! They live several streets away.