A spokesperson for Durham Constabulary said: "Officers are currently dealing with an incident at The Student Loans Company at Lingfield Point in Darlington.
"A potentially suspicious package was discovered shortly before 10am this morning.
"The area is being evacuated as a precaution, and a cordon is in place while emergency services carry out enquiries.
"Please avoid the area while we deal with the incident, and we will update with further information as soon as possible."
