A woman and two men were arrested on kidnap charges yesterday after holding three young hostages at gunpoint in an apartment all night while demanding to talk to President Carter about Iran, authorities said.

No shots were fired and no one was injured, police said, but they confiscated a .22-caliber rifle, a .22-caliber pistol, several hundred rounds of ammunition and a long sword.

When the incident began Friday night, police evacuated more than a dozen families living nearby, and sharpshooters surrounded the two-story building during the all-night negotiations.

Sandra Gouin, 32, and two men walked out of the first-floor apartment and surrendered at about 8 a.m. They were arraigned on charges of felony kidnaping.

Gouin reportedly told police she would keep her hostages until "someone listens to my plans for getting the people out of the embassy in Iran." She said that Carter should speak directly to the Ayatollah Ruhollah Khemeini, and that the United States should send the shah back to Iran.

After acknowledging that she wouldn't get to talk to Carter, Gouin said she would talk to Rep. Norman D'Armours (D-N.H.). Police reached him by telephone in McLean, Va., and, although D'Armours was willing to speak to the woman, they were unable to re-establish telephone contact with her. It was after 4 a.m.

CAMBRIDGE SPRINGS, Pa. -- With sirens blaring and signs proclaiming "Welcome Home, Kathy," this small town held a Main Street parade to celebrate the return of Kathy Gross from Iran.

"For as long as I've lived here, I never knew Cambridge Springs people were so great," a tearful Gross said at a reception. "I love you all. It's nice to be home."

Gross, 22, was one of the 13 hostages at the U.S. Embassy released after more than two weeks of confinement by Iranian students.

The embassy secretary rode through the rural community behind an ambulance, fire trucks and police cars. The procession ended at Alliance College, where Deputy Mayor Richard Mitchell presented a bouquet of roses, state Rep. Tom Swift delivered a message from Gov. Dick Thornburgh, and two clergymen offered prayers of thanks.

EL PASO, Tex. -- A teenager on a jet landing with 71 persons aboard brandished a knife and demanded to go to Iran, the FBI said.

After about four hours on the ground the hijacker was taken into custody and the last passengers were freed aboard the American Airlines 727, which was making a scheduled stop en route from San Antonio to Los Angeles.

The youth was held in $500,000 bail. FBI agents said he told them he is a former paratrooper who served at Ft. Benning, Ga. A spokesman there said he was released from the Army during infantry training because "he couldn't adjust to the military."

While several black leaders rejected Iran's plea for their support of the Islamic revolution, one civil rights leader called the invitation "a compliment" and said he would pledge support if Iranian leaders would invite blacks to negotiate the release of American hostages.

Responding to Ayatollah Ruhollah Khomeini's call for all Moslems and American blacks to rise and "join us in this struggle between the infidel and Islam," Roy Innis, chairman of the Congress of Racial Equality, said support would be given if "black grass-root leaders" were invited to negotiate for the hostages.