Guelph police were in the area of Arthur and Wellington streets Thursday morning after a body was discovered at around 7:30 a.m.

Const. Josh Fraser said the body was discovered in a valley, where a rail bridge crosses over the Speed River.

"Guelph police received a call from a citizen who observed a person they believed needed assistance," he told CBC K-W . "The witness there felt that the person wasn't moving."

When police, fire and paramedics arrived on the scene, they found the person was dead. Fraser said they are still trying to determine when the individual died.

Police are not saying whether the individual is a man or woman, nor are they releasing a name.

"Our investigation is in the early stages here," he said. "We're just treating this as we treat all death investigations: as suspicious."

He said police will be on scene, investigating the death, for "quite some time."