The threat of gun violence is real enough that business owners, schools and houses of worship can buy insurance against it.

Active shooter insurance, which is also known as active assailant coverage, has been around since 2011, according to the Insurance Information Institute.

It’s a policy that covers the cost of property damage and loss of business income, as well as medical expenses and funeral costs for victims.

This insurance supplements — but doesn’t replace — other coverage a business owner may already have, including general liability insurance.

Read more: CNBC