NORTON - A plastic homemade explosive detonated inside a local family's mailbox this weekend, sending the front door flying about 25 feet and blowing out the back.

No injuries were reported in the explosion at 11 John F. Kennedy Drive, acting fire Capt. Ed Burgess said Sunday.

One of the homeowners reported the incident about 12:15 p.m.

"He went out this morning and just found the door across the street," and found remnants of the explosive inside the mailbox, Burgess said.

The incident remains under investigation but appears to be a "random occurrence," Burgess said. Burgess said he is unsure what ignited the explosive. However, "it seems like a possible chemical reaction."

Police Detective Lt. Thomas Petersen said Norton Fire Department arson investigator Richard Medeiros, police Detective Todd Bramwell, the state fire marshal's office and the state police bomb squad responded to the scene.

Several pieces of evidence will be taken to the state police crime lab, Petersen said.