PROVIDENCE, R.I. — Brown University’s president on Monday placed its campus police chief on leave as the Rhode Island university reviews its security policies after a gunman killed two students and injured nine others earlier this month.

Questions surrounding Brown’s security policies have only intensified since the Dec. 13 shooting that rocked the Providence community and led to a lengthy search for the killer. Much of the focus has centered on whether the Ivy League school had security cameras installed in the building where the attack took place in and the overall ease of accessing campus buildings.

University President Christina Paxson said Rodney Chatman will be replaced by Hugh T. Clements, former police chief of the Providence Police Department. Chatman had previously faced a vote of no confidence by the union representing school police officers in October. Local media outlets reported at the time that the union said the vote reflected “serious concerns over the failed leadership, contract violations, and policies that jeopardize public safety.”

The scrutiny over the school’s security has led to an investigation by the U.S. Department of Education, which said earlier Monday that officials are asking Brown for information to help determine if school officials violated federal campus safety and security requirements. This has included seeking security reports, audits, dispatch and call logs, and when emergency notifications have been utilized.

Meanwhile, hundreds gathered at the Cathedral Church of the Advent in downtown Birmingham, Alabama, on Monday to remember Ella Cook, a Brown sophomore who was killed in the attack.

On Dec. 13, gunman Claudio Neves Valente, 48, entered a study session in a Brown academic building and opened fire on students, killing Cook and 18-year-old freshman MukhammadAziz Umurzokov and wounding nine others.

Two days later, authorities say Neves Valente, who had been a graduate student at Brown studying physics during the 2000-01 school year, also fatally shot Massachusetts Institute of Technology professor Nuno F.G. Loureiro at Loureiro’s Boston-area home.