ELLICOTT CITY, Md. (AP) — Howard County, Maryland, police said a 16-year-old girl is dead and her mother was hurt in an attack in their Ellicott City home.

Officers said the alleged gunman is in critical condition after shooting himself in the head.

According to the department, 52-year-old Suzanne Zaremba heard a scuffle about 2 a.m. Sunday in her daughter’s bedroom in the block of 4800 Knoll Glen Road.

Investigators said Zaremba went to Charlotte Zaremba’s bedroom and saw a male in the room. Police said he shot Suzanne and Charlotte Zaremba, then himself.

Charlotte Zaremba died at a local hospital; Suzanne Zaremba was treated and released.

Police said the alleged gunman, a 15-year-old from Ellicott City,  is being treated in Baltimore and was in critical condition as of 4:30 p.m. Sunday.

Police said on that they confirmed his identity  but did not disclose his name. They said it was unclear whether he had any connection to anyone in the household.

The motive is also unclear, police said.

Charlotte Zaremba was a sophomore at Howard High School, according to school officials.

Howard High School principal Nick Novak said student services staff and members of a crisis team would be available to in need of additional support when students return to class Monday morning.

 WTOP’S Tiffany Arnold contributed to this report.