A box containing feces was found on the parking lot of the Korean Consulate in Yokohama, Japan, Saturday morning.

According to the staff of the consulate, the box was 35 centimeters wide, 5 centimeters long and 5 centimeters high. Written on the box was the following message: "This is revenge against the Yasukuni blast." It was reported that the message was signed by an anti-Korea group.

An employee at the consulate found the box and reported it to local police, who then took it for further investigation.

Staff at the consulate reported that an unidentified man was caught by surveillance cameras around 1 p.m. Friday, throwing the box over the wall from outside the premises.

Police are examining the footage to identify the man. The Korean embassy in Japan has requested strengthening security at all consulate offices in Japan.

Meanwhile, a Korean man was arrested in Japan Wednesday for a blast in the Yasukuni Shrine in Tokyo last month. A small explosion occurred in a restroom, where a burnt metal pipe, batteries and gun powder were later found. There were no injuries.