At 10:30 a.m., Trenton police responded to the 300 block of West State Street and found Biggs in a third-floor bedroom, and Whitting shot in a stairwell leading upstairs, the Mercer County Prosecutor's Office said. Both were pronounced dead at the scene, authorities said.
A person of interest was detained on unrelated charges, but no one has been arrested for the killings, authorities said.
Trenton Mayor W. Reed Gusciora said "this horrific act of violence has shaken our community."
"No mother and daughter should ever be taken from this world in such a tragic and violent way," Gusciora said. "As a city, we mourn alongside you and stand with you in grief and in solidarity."
Gusciora said crisis counselors will be available in schools and a prayer vigil is being planned for Cadwalander Park.
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