SANTA ANA (CBS) — Authorities are investigating a blaze that devastated a Santa Ana church early Thursday morning.

Authorities received a call about a fire at Our Lady of Guadalupe Church at 1:30 a.m.

Crews arrived at the intersection of Third Street and Grand Avenue to find a huge portion of the church, which was under construction, engulfed in flames.

The 9,000-square foot building was attached to the original structure.

Investigators say the unfinished part of the church, which has been deemed a total loss, is now in danger of collapsing.

The church itself sustained extensive water damage.