A 67-year-old man unhappy with the health care he’d received opened fire at a clinic in the US, killing one person and wounding four others, and bomb technicians were investigating a suspicious device left there and others at a motel where he was staying, authorities said, AP reported.

The attack happened Tuesday morning at an Allina clinic in Buffalo, a community of about 15,000 people roughly 40 miles (64 kilometers) northwest of Minneapolis.

Authorities said Gregory Paul Ulrich, of Buffalo, opened fire at the facility and was arrested before noon.

As authorities searched the clinic for more victims, they found the suspicious device and evacuated the building, Wright County Sheriff Sean Deringer said.

Police Chief Pat Budke said during a news conference that Ulrich has had a long history of conflict with health care clinics in the area.