Renter's insurance usually covers rioting, looting
If you have renter's insurance today, you are likely covered for malicious mischief, that includes vandalism, theft, riots or civil commotion. It could include loss from defacing from graffiti, stolen property, and vandalized fixtures.
However, with losses from recent riots across the country, it is unknown if insurers will now write policies that cover riots in urban areas. Check with your insurer to find out.