NEW YORK, June 1 (Xinhua) -- Seven people, including the suspected gunman, were found dead on Monday following a series of shootings at multiple locations in Muscatine, Iowa, according to the Muscatine Police Department.

Police said officers responded to a report of a shooting at a residence at about 12:12 p.m. local time (1712 GMT) and found four people suffering from gunshot wounds inside the home. All four were pronounced dead at the scene.

Investigators identified a 52-year-old man as the suspect, who had left the residence before officers arrived and was later found on the Riverfront Trail with a self-inflicted gunshot wound. He was pronounced dead at the scene.

Police officers later discovered another adult man dead from an apparent gunshot wound inside a separate residence, as well as a second adult man dead from an apparent gunshot wound at a local business.

"The preliminary investigation indicates the shootings stemmed from a domestic dispute," police said in a news release. "At this time, all victims are believed to be family members of the deceased suspect."

An investigation is underway. ■