BRAINERD, Minn. (AP) _ A fire that began at a Planned Parenthood clinic and destroyed several nearby businesses was arson, fire officials said Thursday.

Whoever set the fire can be charged under a new federal law that prohibits blocking access to women's health clinics, U.S. Attorney David Lillehaug said.

The fire ''is another link in a chain of terrorist conspiracy,'' said Pamela J. Maraldo, president of Planned Parenthood Federation of America.

Besides the clinic, Wednesday's fire damaged a pizza parlor, a cable TV office, an accountant's office, a lawyer's office and a vacant office. No one was injured.

Anti-abortion leaders said it was unfair to blame protesters.

''To automatically assume that a pro-lifer is responsible is pure speculation,'' said Christina Diaz, a spokeswoman for Minnesota Citizens Concerned for Life.

State Planned Parenthood director Tom Webber said the clinic would reopen.