GREAT FALLS, Mont. (AP) - A city prosecutor said an anti-abortion group's graphic pictures of mutilated fetuses were a traffic hazard and could not be shown at demonstrations along city streets.

Members of Pro-Life Great Falls reluctantly ended their regular Friday demonstration at a Planned Parenthood office when Assistant City Attorney Kory Larsen told them the signs had to go or be confiscated.

"He is trampling on our First Amendment and constitutional rights," Jonathan Martin said. "We were told by police that as long as we stayed within the law and did not scream at people, we were all right to be there. Now all of a sudden we're lawbreakers."

Larsen, accompanied by police, gave protesters five minutes to put their signs away. He cited a public nuisance statute and told them their protest was a risk to public safety because of rubbernecking drivers.

He told the demonstrators they could continue their protest with signs that had no photographs, but they chose to leave.

Police and city officials have received complaints about the signs since the demonstrations began several months ago, Larsen said. One traffic accident and several close calls have been blamed on the signs.

Martin denied his group's signs caused the accident or the near-misses.