SAN ANTONIO (AP) — Police say a 14-year-old boy has been charged in the South Texas shooting deaths of a woman and her pregnant daughter whose unborn child was delivered but later died.

San Antonio police say the suspect faces a charge of capital murder of multiple persons in the April 9 gunfire in the parking lot of an apartment complex.

Investigators Tuesday didn’t release a possible motive or say whether the boy, who’s not identified publicly because he’s a minor, knew the victims.

Police say the boy was already in juvenile custody in an unrelated aggravated robbery case when the warrant was served Monday in connection with the deaths of 37-year-old Janette Quiroz and 18-year-old Bernadett Quiroz. The younger woman’s unborn daughter was delivered but died several days later.

Further details weren’t immediately available.