Sangster elementary school principal Chris Summers resigned suddenly Friday, only days after the school year began in Fairfax County.

School officials said that the Summers left the post voluntarily, for personal reasons. He became principal of Sangster, a 900-student school in Springfield, in 2011 and had previously served as assistant principal at Kings Park Elementary.

In a letter sent home to parents of Sangster students, assistant superintendent Angela Gwynne-Atwater wrote that an acting principal would be named soon. The current assistant principals at Sangster, Allison Jankovich and Addison Smith, would continue to serve in their current positions, she said.

“I have every confidence that these excellent educators will provide strong and capable support and leadership for students, parents, and staff at Sangster Elementary,” Gwynne-Atwater wrote.