Police say a woman suspected of shooting and killing her 8-year-old daughter and stepfather overnight at an apartment complex in Port St. Lucie, Florida, is now under arrest.

The police department confirms 28-year-old Alyssa Marie Torres was located by detectives around 10:30 a.m. Monday and taken into custody.

A news conference about the case is scheduled for 3 p.m. at Port. St. Lucie Police Department headquarters.

According to investigators, at 12:30 a.m. police responded to the Waterleaf Townhomes Apartments for reports of a shooting involving two fatalities.

Police said Torres shot and killed her stepfather, believed to be in his early 50s, as well as her own 8-year-old daughter.

St. Lucie County Fire Rescue also transported Torres' mother to a nearby hospital with non life threatening injuries. Police said Torres' mother was not shot.

Detectives are investigating the circumstances of the double homicide, and at this time the motive remains a mystery.

Senior Sgt. Lisa Carrasquillo said police don't believe Torres lived at the apartment where the shooting occurred.

The names of the victims have not been released.

