DES MOINES, Iowa (AP) — Five residents of a six-story apartment building that partially collapsed in eastern Iowa remained unaccounted for Tuesday, and authorities feared at least two of them might be stuck inside rubble that was too dangerous to search.

The three other missing residents are not believed to have been in the building when it started collapsing Sunday afternoon, said state Rep. Monica Kurth. Mayor Mike Matson confirmed at a news conference that not all the residents were accounted for.

A group of protesters held signs and chanted near the building Tuesday morning, arguing t...