A contractor was fatally struck by a road roller Wednesday morning while working on a project in Delaware County, officials said.

The contractor was working on a project for Ridley Park Borough on the 400 block of Free Street near Ridley Park Middle School, Police Chief Robert M. Frazier said in a statement.

The Delaware County District Attorney’s Office is assisting with the investigation, Frazier said.

Police have not released the person’s identity or other information about the incident.

Lee Ann Wentzel, the Ridley School District superintendent, said the crew was working on a “Safe Routes to School” project for the borough by replacing a footbridge and installing sidewalks. No district employees were involved in the incident, Wentzel said.

“It’s unfortunate and it’s something no one really ever expects," Wentzel said. “We are saddened at the loss of life.”