A woman told a local radio station that her husband had threatened to fire shots at a school, police said.
Later, the radio station received an e-mail saying "something big" was going to happen, CNN's Rich Phillips reported.
During a noon news conference, a police spokesman said all students, faculty and staff are safe, and all approximately 300 schools and administrative buildings in Broward County were locked.
Police in Broward County, Florida, have lifted a school lockdown; Pembroke Pines police Capt. Dan Rakofsky said.
Broward County Schools Lockdown Lifted
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