Oklahoma Gov. Kevin Stitt on Wednesday signed into law the nation’s strictest abortion ban, making the state the first in the nation to effectively end availability of the procedure.

State lawmakers approved the ban enforced by civil lawsuits rather than criminal prosecution, similar to a Texas law that was passed last year. The law takes effect immediately upon Stitt’s signature and prohibits all abortions with few exceptions. Abortion providers have said they will stop performing the procedure as soon as the bill is signed.