GRANT COUNTY, S.D. (KELO) — Officials in Grant County are looking into what caused a new building to collapse Monday evening.

Grant County Emergency Management says first responders were called to the scene just before 5:30 p.m.

The rafters collapsed during new building construction at Blooming Valley Dairy southwest of Summit.

Authorities say 21 workers were involved, and 10 people were taken to area hospitals.