Village of the Damned

The quiet coastal town of Midwich in California's Marin County is invaded by an unseen force, causing a blackout for six hours, which leaves ten women mysteriously pregnant. Nine months later, the babies are born simultaneously on one night, though one is stillborn. At first, they all appear to be normal, but it does not take the parents long to realize that they aren't. As they grow older, the children are shown to all have pale skin, white hair, fierce intellect, and cobalt eyes. However, they also do not appear to possess a conscience or personalities. The children display eerie psychic abilities that can result in violent and deadly consequences whenever they experience pain or provocation.
The children soon "pair off," except for one of the boys, David, whose intended partner was the stillborn baby. As a result, he shows human compassion while still resembling the other children and retaining some degree of psychic powers. Their leader is Mara, the daughter of a local physician, Dr. Alan Chaffee; her mother, Barbara, commits suicide by walking off an ocean cliff, considers her father less important. Because of his childhood loss, David understands what the other children do not: emotion. He and his mother Jill McGowan (the local school teacher) share a brief conversation about this, displaying empathy and remorse. The children eventually move to the local barn as their classroom and for survival.
Soon it is revealed that there are other colonies of blackout children in foreign countries, but they were quickly eliminated due to their inhuman nature. The scientific team in Midwich quickly flees the town to escape the chaos. Government scientist, Dr. Susan Verner, dissects herself after being forced to show the children the preserved stillborn baby she secretly kept to perform an autopsy, which is unveiled as an alien. An angry mob gathers to kill the children, but the leader is set on fire and burns to death while the state police sent there are instead hypnotized into shooting each other in a chaotic gun battle.
In order to rid the town of the children, Alan devises a plan: to detonate a briefcase of explosives inside the children's classroom. By thinking of a brick wall, he is able to create a mental barrier and keep the presence of the bomb a secret from the children. Jill begs him to spare David because he is not like the others, and Alan agrees. He attempts to do this by asking David to leave the classroom to get his notebook from his car. The children begin to suspect that Alan is hiding something, and they slowly "destroy" the wall. Finally, Jill shows up, but the children stop her and attempt to use mind control. David, tired of this, rushes to her defense and knocks Mara over. The children turn on David, but Jill rushes him from the building. As soon as the children discover Alan thinking of the bomb, it detonates, killing everyone inside, along with Alan.
Jill and David survive the massacre; she says that they will both move to a place where nobody knows them. David looks off into the distance as they drive away.

Question: Where is Alan going to detonate the briefcase of explosives?
Answer: The children's classroom