Witnesses to the disaster on Second Ave. | East Villager & Lower East Sider

Witnesses to the disaster on Second Ave.

Crowds watched firefighters respond to the scene after the explosion and then battle the raging fire.  Photos by Clayton Patterson

Crowds watched firefighters respond to the scene after the explosion and then battle the raging fire. Photos by Clayton Patterson

Lower East Side documentarian Clayton Patterson was on the scene at E. Seventh and Second Ave. after Thursday’s gas explosion and captured the crowds of onlookers watching firefighters battle the blaze.

Firefighters attacked the raging blaze from a bucket ladder on Second Ave.

Firefighters attacked the raging blaze from a bucket ladder on Second Ave.

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Police and 250 firefighters flooded to the scene and cordoned off the possible "collapse zone" as another building was still at risk of going down on Thursday evening.

Police and 250 firefighters flooded to the scene and cordoned off the possible “collapse zone” as another building was still at risk of going down on Thursday evening.