Investigators say they believe a woman fatally shot her stepfather, critically injured her mother and killed two other people at different locations in the Houston area before killing herself.

Houston police spokeswoman Jodi Silva says investigators found the bodies Friday. Police haven't said what may have prompted the shootings, nor have they released any details about the alleged shooter or the victims.

Silva says investigators believe the woman shot her stepfather and mother Friday morning at their Houston home. Officers went to the house while responding to a call for a welfare check.

Police found another man fatally shot in a nearby home. Fort Bend County sheriff's deputies found a woman fatally shot in the nearby town of Fresno who Silva says may have been related to the alleged shooter.