PAWTUCKET, R.I. (AP) — A city official says three construction workers have been hurt in Pawtucket, one critically, when a stairwell collapsed in a mill they were rehabilitating into housing.

Director of Communications Wilder Arboleda says the stairwell collapsed Monday from the second floor down. He says three construction workers are being taken to a hospital.

He says everyone is accounted for. He did not immediately know the name of the construction company or the workers’ names.

Arboleda says the workers are rehabilitating the mill and building 140 residential units. The building is located adjacent to Hope Artiste Village, a well-known mill restoration that has a mix of artists’ studios, shops and office space.

Arboleda says federal workplace investigators have been alerted and are headed there.