Action News has learned that L&I is in the process of revoking the license of Q-Construction, the contractor listed for the project.
Investigators say improper digging at 633 Thompson Street led to serious cracks in a shared foundation with the home at 635.
Investigation underway into demolition of Fishtown homes
Both collapsed as workers were in the process of demolition.
The scene has been cleared, and the Philadelphia District Attorney's Office is now investigating.
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