(CNN) A 48-year-old man has been charged in the killings of four people in the New Brunswick city of Fredericton, police said, and investigators were working to determine a motive.

The suspect is Matthew Vincent Raymond of Fredericton, the capital of the Canadian province.

He was charged Saturday with four counts of first-degree murder in connection with Friday's shooting. Raymond is in custody and faces a court appearance on August 27.

Lawrence Costello, 45, and Sara Burns, 43, were the two slain Fredericton police officers.

The victims included two Fredericton police officers, Lawrence Robert Costello, 45, and Sara Burns, 43. Both of them were constables. Costello leaves behind his partner and four children, Fitch said, while Burns is survived by her husband and three children, police said.

Two Fredericton residents also were slain -- Donald Adam Robichaud, 42, and Bobbie Lee Wright, 32.

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