Cause of East Harlem explosion that killed 8 still undetermined

The cause of last week's deadly explosion in East Harlem has not yet been determined, but officials are revealing more information about the aging infrastructure.

The gas main serving the two collapsed buildings was 127 years old.

The gas main serving the two collapsed buildings was 127 years old. (3/17/14)

MANHATTAN - The cause of last week's deadly explosion in East Harlem has not yet been determined, but officials are revealing more information about the aging infrastructure. 

The gas main serving the two buildings that collapsed Wednesday, killing eight people and injuring dozens, was 127 years old. 

Tests on the soil there just hours after the blast show the natural gas levels as high as 20 percent, and federal investigators say that number should be at zero. The initial site cleanup is now ending, allowing authorities to step up their probe. 

Meanwhile, church services were held Sunday in memory of the victims. Mayor Bill de Blasio attended services for two affected churches, one destroyed in the explosion and a second that lost two of its members.

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