A 60-year-old man was arrested after allegedly killing four people in a “targeted” series of shootings on Monday, the police in British Columbia said.

The gunman, whom the authorities had not named as of Tuesday morning, killed two men and two women in three locations within about three miles of one another in the city of Penticton, said Ted De Jager, superintendent of the Royal Canadian Mounted Police. The first shooting was reported at 10:30 a.m., and the suspect had turned himself in by 11:30, he said.

The victims were not identified, pending notification of their families. But the police said they believed the gunman knew all of the victims.

“While the investigation remains active and ongoing, we do believe this was a targeted incident,” Mr. De Jager said at a news conference on Monday.