Police at the scene of the shooting in Canada. Reuters

The man behind a fatal shooting in an eastern Canada city has been charged with four counts of first-degree murder, police said on Saturday.

Authorities identified the gunman as Matthew Vincent Raymond, who opened fire in the sleepy city of Fredericton, New Brunswick early on Friday, killing four including two officers.

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Raymond, who was injured and hospitalised, was charged with four premeditated homicides, though police did not provide details of his motives.

He will remain in custody as he awaits a court appearance slated for August 27, Fredericton police said in a statement.

Law enforcement officials released the names of the two civilians slain in the shooting as Donald Adam Robichaud and Bobbie Lee Wright.

On Friday authorities in the provincial capital had identified the two officers killed as Lawrence Robert Costello and Sara Mae Helen Burns.

The incident sparked panic in the city as Canada grapples with rising gun violence, with some calling for a handgun ban.

The mass shooting is the second in the province in recent years, and comes only weeks after a man opened fire on July 22 in a bustling Toronto district, killing an 18-year-old woman and a 10-year-old girl while wounding 13 other people.