San Antonio police are investigating what led to three people being stabbed in a family altercation on the city's west side.

Around 1:30 a.m. Sunday, San Antonio police responded to a stabbing call at a home in the 6700 block of Blue Oak Lane not far from the intersection of Marbach Road and Pinn Road.

Investigators say family violence sent two women and one male to University Hospital with stab wounds. One victim was last reported in critical condition.

Police found a butterfly knife on the ground at the scene.