NHK reports the head of the studio has said they had received death threats.

https://www3.nhk.or.jp/news/html/20190718/k10011997571000.ht... ( Japanese. )

See the FAQ :

https://news.ycombinator.com/newsfaq.html

And guidelines :

https://news.ycombinator.com/newsguidelines.html

This is the well-known Kyoto Animation studio. ( KyoAni, 京都アニメーション )

Edit : The casualties seem to climb up to 24.

https://www3.nhk.or.jp/news/html/20190718/k10011997421000.ht... ( Japanese. )

This is quite unprecedented.

Edit 2 : Prime Minister Abe offering condolences.

https://mobile.twitter.com/AbeShinzo/status/1151748479531667... ( Japanese. )

Life is hard enough in the anime industry these days as it is ( as several stories posted here have mentioned recently ), even in top notch studios like KyoAni.