An industrial tunnel in Los Angeles collapsed partially. None of those rescued had major injuries, authorities said.

Officials revealed new details to KTLA on Thursday morning regarding the frightening tunnel collapse in Los Angeles’ Wilmington neighborhood, which resulted in a large rescue mission to recover dozens of trapped workers on Wednesday night.

The collapse was reported just before 8 p.m. near the intersection of South Figueroa Street and Q Street. As many as 31 tunnel workers were rescued and accounted for following the collapse, according to the officials.