KYODO | April 18, 2017
KYOTO –- A brown powder was found scattered Tuesday at around 50 locations in Nijo Castle, a UNESCO World Heritage site in Kyoto, police said.
The substance, apparently curry powder, was found by a guide near a corridor of the Ninomaru Palace...In February 2015, the Ninomaru Palace in the castle was vandalized with an oily liquid...more...
Also refer to the string of past oily liquid, bio-terror attacks:
http://green139.blog.fc2.com/blog-entry-1119.html
http://green139.blog.fc2.com/blog-entry-1119.html