AVIANO, Italy — Aviano Air Base schools were issued an all-clear message Tuesday afternoon following a lockdown that came while security forces personnel searched for two unidentified people on the installation.

“Normal school access has resumed,” the Department of Defense Education Activity said in a message to parents. “School dismissal will occur at the regular time.”

The unidentified people were reported on base Tuesday morning, the 31st Fighter Wing said. Air Force and Italian law enforcement personnel are investigating the incident, the wing statement said.

It wasn’t immediately clear Tuesday afternoon whether the two people were found.

The lockdown was “not related to the school; it’s related to the installation,” Jessica Tackaberry, DODEA-Europe spokeswoman, said Tuesday morning. “The schools are just following installation protocols.”

Both the elementary school and the middle/high school operated normally during the lockdown, with the exception of no one being allowed in or out of the buildings, Tackaberry said.

DODEA at 10:07 a.m. Tuesday had issued an emergency alert message to parents, saying that “students are safe inside. No one in or out of the schools until further notice. Business as usual inside the building.”

Security forces were checking identification cards throughout the area, among other precautions being taken. By midday, the 31st Fighter Wing limited access to Area 1 on the base, which is located in Italy’s northeast.

The wing on Tuesday afternoon declined to say whether the two people they were looking for were found, citing “operational security concerns.”