Schools in Florida's second-largest county were on lockdown Wednesday after police said an unidentified woman called a radio station and said her husband might go to a school and start shooting.
Pembroke Pines Police Capt. Daniel Rakofsky said an earlier e-mail to the radio station, maybe from the man in question, said "something big was going to happen," possibly at a post office or a school.
Schools in Pembroke Pines, a suburb of Fort Lauderdale, were initially placed on lockdown as a precaution. The lockdown was then extended to all 300 Broward County schools. The county has nearly 257,000 students.
Neither the man nor the woman have been identified, though police said they were following several leads.
Rakofsky said the threat was not credible and that all schools are safe. He would not identify the radio station.
Nervous parents flooded telephone lines and showed up at schools as word of the lockdown spread.
Irma Hernandez had tears in her eyes as she and her husband waited outside Charles W. Flanagan High School, where her 15-year-old son is a student.
"We're just nervous, scared," she said. "We don't know what's going to happen."
The Associated Press contributed to this report