COLLEGE STATION -

Four construction workers were rushed to hospitals after a Texas A&M building under construction collapsed Saturday morning.

Three of the workers suffered what are described as critical injuries.

WATCH: Raw aerials of TAMU Equine Center collapse

Emergency crews from Byan, College Station and Texas A&M raced to the construction site in the 3500 block of F & B Road just before 11 a.m. Saturday after getting reports a steel frame had collapsed and four workers were inside the area.

According to the College Station Fire Department, it took just over 20 minutes to rescue those four workers and get them to hospitals.

Emergency crews then had to wait to make sure the building was structurally secure before they went back in to look for others.

Three of the most critically injured workers were taken to St. Joseph's in Bryan. A fourth was taken to College Station Medical Center in stable condition.

Construction on the $80 million dollar Texas A&M Equine Center began last fall. The collapse happened at a 300-foot long barn building. The general contractor, Gamma Construction, is out of Houston.

According to the university, the company will now conduct its own investigation to figure out what sent the rush of steel to the ground below.

According to OHSA's website, Gamma Construction has been cited for eight safety violations since 2008. Five of those are considered serious with fines totaling about $14,600 dollars.

PHOTOS: TAMU Equine Center collapse

Published On: Jun 22 2013 01:39:05 PM CDT   Updated On: Jun 22 2013 02:38:37 PM CDT

See images of the aftermath of the building collapse Saturday at the Texas A&M Equine Center. (Photo Credit: KBTX)

1 / 14

Images of the aftermath of the building collapse Saturday at the Texas A&M Equine Center.