A lockdown was lifted at an Air Force base in Dover, Delaware on Thursday after initial reports of a possible shooter, USA TODAY reported.
A shelter in place was issued around 11 a.m. and ended at 2:40 p.m., according to a base spokesman. Authorities did not locate a shooter.
Students from Positive Outcomes Charter School in Camden, New Jersey were visiting a museum at the base when the incident occurred.
"The base went into lockdown and our students were secured in a protected area," said Edward Emmett, director of the school. All of the students were safe and returned to school, USA TODAY said.
Additionally, Maj. George S. Welch Elementary School -- located on the base -- was on lockdown. Though students were not allowed in the hallways, classes continued through the investigation.
"At this time we have no information that would lead us to believe that there is an active shooter on the base," Earlier Airman First Class William R. Johnson said.
According to Johnson, the suspicious person was seen around Building 706.
The safety of our people is our top priority," Col. Randy Huiss, 436th Airlift Wing vice wing commander said in a news release. "We take this report very seriously and are taking the necessary precautions to investigate this matter."
The Air Mobility Command Museum was on lockdown for about 30 minutes before being allowed to reopen.
"We were given permission to reopen because we are in a separate enclave," said museum director Mike Leister. "We locked the place down, we gathered everybody up and passed the information out and when we got permission to open back up everybody went about their business."
