Police: Device found inside for-sale Massachusetts house was rigged to explode

An electrical inspector made a terrifying discovery inside a Massachusetts house on Tuesday: A mechanism wired to a light switch that was rigged to cause an explosion when turned on.

The device was found when the homeowner, his attorney, and the electrical inspector were in the house doing a pre-sale inspection. Wires were strung through several rooms from a gallon container of an incendiary substance, and "it took some work to put it in there," Milton Police Chief Richard G. Wells Jr. said during a press conference. "[They] definitely had malicious intent in what they did."

Bomb specialists came into the building, and after several hours said the mechanism had been disarmed and the house was safe. The home's former renters are being sought by the authorities as persons of interest in the case, NBC News reports. Last week, police who were called on a vandalism complaint found the drains inside the house plugged with cement.

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