At an abbreviated press briefing, Dallas County, Iowa, Sheriff Adam Infante said police received reports of an active shooter at the school at 7:37 a.m. local time and that the first officer arrived within seven minutes and “located multiple gunshot victims.”

“We’re still unclear exactly how many are injured or what the extent of those are, but we’re working on that right now,” Infante said, adding: “There is no further danger to the public.

The community is safe. We’re just now working backward trying to figure out everything that happened and then make notifications.”

School had not started yet when the shooting occurred, Infante said, “so luckily there [were] very few students and faculty in the building.”

Another briefing is expected later this afternoon.