South Korean engineering professor hurt by explosive device sent to university office

A South Korean professor was injured Tuesday after opening a concealed explosive device brought to his university office in Seoul, police said.

The crudely made device was made with explosive powder, four batteries and dozens of bolts that were packed inside a vacuum bottle, and it exploded after the professor opened the bottle inside his office, according to the Seoul Metropolitan Agency.

The victim, identified only by his surname Kim, is a professor in the mechanical engineering department at Yonsei University.

Watch: South Korean professor hurt by explosive device

The professor found the bottle inside a box that was inside a shopping bag hung on his office door, but police have yet to find the sender. The professor had burns in his hands, chest and necks, but his injuries weren’t considered life threatening.