A large mailbox was damaged Sunday in Fallston by an explosive device put inside it, fire officials said.
The damage to the large blue steel commercial mailbox at the U.S. Post Office in the 2400 block of Watervale Road was discovered by a passerby around 7:35 a.m. Sunday, according to a notice of investigation from the Maryland State Fire Marshal's Office.
"Someone dropped an unknown explosive device in and it exploded inside. And it caused a fire as a result," Senior Deputy State Fire Marshal Bruce Bouch said.
Members of the fire marshal's bomb squad collected the evidence at the scene, what was left of it, Bouch said, to determine what, specifically, was put inside the mailbox and for any indication as to who may have done it.
Bouch said his office doesn't investigate many calls like this.
"This time of year, all the stupidity happens. The young ones come out - it's just a nuisance," he said.
The blast blew out the bottom of the mailbox and the front panel, he said.
"We collected the remains. We still don't know exactly what the device was, but it was probably an illegal firework of some sort," he said.
It's unclear when the device was put inside the mailbox.
"What fire there was burned itself out," Bouch said. "Luckily, from the looks of it, there probably wasn't all that much mail inside."
Damage to the mailbox is estimated at $1,000, according to the notice. Damage to the contents is unknown, because investigators don't know what was inside the mailbox.
The Harford County Sheriff's Office, U.S. Postal Police and U.S. Postal Inspector assisted the fire marshal's office in the investigation.
Anyone with additional information is asked to contact the fire marshal's bomb squad office, 410-859-7152.