Police did not have a motive but believed the "public at large" was not in danger.
Four people were found dead on Monday after a "multiple homicide" at a North Dakota property management business, police said.
The bodies of three men and a woman were found inside RJR Maintenance and Management in the city of Mandan, the city's police chief, Jason Ziegler, told a televised news conference. Police did not give the cause of death or the identities of the victims.
"This is currently being treated as a multiple homicide investigation," Ziegler said.
Police did not have a motive but believed the "public at large" was not in danger, Ziegler said.
"It looks like an isolated incident," he said, adding: "We are looking for a suspect."
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