WINDSOR LOCKS - State police are investigating a bomb threat called in to Bradley International Airport Friday, prompting a search for explosives that involved four agencies and spanned more than five hours.

Nothing was found, and authorities cleared the scene at 6 p.m.

The call came in at about 12:30 p.m., said Sgt. H. Chris Johnson. The caller was not specific about where the alleged bomb was located, he said.

Airport security, the state police, the FBI and the Transportation Security Administration responded to search the airport. Bomb sniffing dogs were brought in, too, but no explosives were found.

Two parking garages were closed to incoming traffic during the search, but airport operations were not disrupted, Johnson said. No one was evacuated, police said.

— Christine Dempsey