A police officer was arrested for joining an anti-abortion protest outside a clinic in Las Vegas Saturday and eight protesters in New Jersey chained themselves together inside a clinic as more than 350 people were arrested in five states.

Bristol, Tenn.; Cranston, R.I.; and St. Petersburg, Fla. also were sites of demonstrations by groups that have been protesting regularly since last summer outside abortion clinics.

In Las Vegas, traffic officer Chet Gallagher was assigned to duty elsewhere but rode a police motorcycle to the protest site and joined the group after roll call, said police Lt. Steve Gammell.

Gallagher defended his action in a statement after his arrest, saying "I have a sworn responsibility to protect human life."