EFFORT, Pa.—Police are looking for a northeastern Pennsylvania man they say killed his girlfriend and their son in their apartment.

Police say 23-year-old Michael John Parrish of Effort killed 21-year-old Victoria Marie Adams and 2-year-old Sidney Michael Parrish late Monday night. Police said he remained at large Tuesday afternoon and was believed to be carrying guns.

Effort is about 65 miles north-northwest of Philadelphia.