Attacked.

He returns immediately once reported they caught the responsables. He lets DaNa and Arashi stay back a bit longer just to be sure.
He makes sure they are in jail and unable to even hurt themselves to die. He himself tortures them for informations until they confirm something. They come from Hunai, someone ordered them to do it but they don't yet reveal who.

Meanwhile, he finishes to work on the project and decides to move all the builders on it, since they are left homeless. He wants it done fast, so that his family can return safely and have a great place where to be. Xingxi sends some help too and in Hunai, their people begin to deeply investigate what happened.