Kevin Maxwell, chief executive of Prince George's County Public Schools, and Rushern L Baker III, county executive, speak to reporters in August. (dsg/The Washington Post)

Maryland education officials announced a hotline number and email address for reports of potential improper activity amid an investigation of alleged fraud in graduation rates in the public schools of Prince George's County.

State officials hired the Washington firm Alvarez & Marsal Public Sector Services in August to conduct the audit of graduation rates, following claims of tampering with student grades and credit counts in the 132,000-student system.

With the probe underway, state officials on Monday publicized a designated hotline — 833-535-6103 — and email address: PGCPSSpecialReview@alvarezandmarsal.com.

Alvarez & Marsal is scheduled to deliver a report on its findings by Oct. 31.

Prince George's officials say they welcome the review. Kevin Maxwell, chief executive of the school system, said in August that in a district so large, some employees may not have "dotted I's and crossed T's" but no order came from the top to do anything improper.

"If mistakes were made, we want to know about them so they can be corrected," John White, district spokesman, said this week.

A four-member minority bloc on the Prince George's school board alleged several months ago that whistleblowers had come forward with evidence that hundreds of students had graduated without meeting state graduation requirements.