Miami, Florida (CNN) -- Police lifted the lockdown on all schools and district facilities in Broward County, Florida, Wednesday after receiving information that a threat to the facilities had diminished, authorities said.
Schools and government offices across the county had been secured by police after a caller on a local radio station said her husband intended to go to a school and fire a gun, according to Pembroke Pines Police Capt. Dan Rakofsky.
He said the radio station also received an e-mail saying "something big will happen at a government building."
Police said they are continuing efforts to trace the e-mail and the call, but have not located the people involved.
Police had requested the full-scale lockdown as a precautionary measure, Pembroke Pines Deputy City Attorney Julie Klahr told CNN. The school system's administrative offices also were locked down.
The county has 231 traditional schools and centers, 69 charter schools and one virtual school, according to a Broward County school website.
The "possible threat" was received at 8:40 a.m. "in reference to the schools within the city of Pembroke Pines," according to the Pembroke Pines Police Department.
All students were expected to leave school at normal times, but Wednesday's school activities were canceled, according to Broward County Public Schools Superintendent James Notter.
Pembroke Pines is about 20 miles northwest of Miami.