FAIRFIELD — Dwight Elementary School classes were back in session at midday Wednesday after a bomb threat prompted officials to lockdown the school about two hours earlier.

After a security sweep of the Redding Road elementary school, classes resumed shortly after noon.

The threat — via what is described as a “robo-type” call — was received about 10:40 a.m., and police were immediately alerted by school officials.

Police and fire units were dispatched to the scene, but reported after checking the premises that other than disrupting the school day, there were no other problems caused by what was called a “non-credible” threat.

A bomb-sniffing dog detected nothing unusual at the school, officials said.

Roads around the school initially were blocked off, and pre-school students were led out of the school so parents were able to pick up the youngsters at the end of the driveway.

Roads around the school were re-opened after officials gave the all-clear.