WEST, Texas (AP) — Federal investigators will continue searching the wreckage of a Central Texas fertilizer plant into the weekend.

That will delay indefinitely the return home of residents displaced by the evacuation of much of the town of West after the Wednesday blast.

Franceska Perot is a spokeswoman for the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives. She said late Friday that investigators were still combing through debris and would continue Saturday. Until they’re finished, she said residents cannot return to their homes and she had no timetable for completion of the agents’ work.

The investigators are inspecting the wrecked West Fertilizer plant to collect debris and other evidence that may point to a cause of the blast that killed at least 14 people. About 200 people were injured.