Rhode Island police began stopping cars with New York plates Friday. On Saturday, the National Guard will help them conduct house-to-house searches to find people who traveled from New York and demand 14 days of self-quarantine.

“Right now we have a pinpointed risk,” Governor Gina Raimondo said. “That risk is called New York City.”

New York is the epicenter of the coronavirus outbreak in the U.S., on Friday reporting a total of 44,000 cases.

Rhode Island has just over 200, and it has begun an aggressive campaign to keep the virus out and New Yorkers contained, over objections from civil liberties advocates.