SURFSIDE, Fla. (AP) — A 2018 engineering report said that the oceanfront condominium building that collapsed this week near Miami had “major structural damage” to a concrete structural slab below its pool deck that needed extensive repairs.

The report was released by the city of Surfside as rescuers continued to dig through the rubble Saturday. They were trying to find any of the 159 people who remain unaccounted. At least four people were killed. The engineering report did not warn of imminent danger from the damage.

But it did note the need for costly repairs to fix the slab as well as damaged concrete columns beams and walls in the parking garage.