my sister's husband got violent yesterday, help

my sister has been married for the past one year, they are both working. yesterday my BIL tried to force my sister to do some shady financial transactions from her account, which she refused to do. When he kept asking her for money, she went to an ATM and withdrew cash and gave it to him. Then he got violent, he threw his plate of food and smeared the walls, curtains and bedsheet with food. He tossed the cash in the air, picked it up and tore it to pieces. He came very close to my sister then turned around and punched the door. My sister is scared for her life. She couldn't record his outburst, but has pictures of the torn notes and smeared walls. She also has the torn notes safe in her custody. What should we do?