Dulles, Virginia:
Roxana Saberi, the American journalist who spent four months in an Iranian prison was greeted on Friday afternoon with cheers and hugs from friends as she returned to the United States.
Saberi told reporters upon her arrival that singing the national anthem helped keep her going.
"It may sound corny, but I'm so happy to be home in the land of the free," she said.
The 32-year-old journalist spoke briefly with reporters after arriving at Washington Dulles International Airport with her parents and a family friend.
She spent a week in Vienna recuperating after being released from prison in Iran.
Asked how she was feeling, she said, "Very good."
"I wish I could personally thank all those who supported me during my 100 days in prison," she said.
Among those she thanked were President Barack Obama, Secretary of State Hillary Rodham Clinton, North Dakota lawmakers, human rights groups and the Japanese government.
Saberi, who grew up in Fargo, North Dakota, and moved to Iran six years ago, has dual citizenship.
She planned to spend a few days in the capital before returning to her home state, according to Democratic Representative for Congress Earl Pomeroy, of North Dakota, who issued a statement saying he was eager to welcome her home.
Saberi was arrested in late January and convicted of spying for the United States in a closed-door trial that her Iranian-born father said lasted only 15 minutes.
She was freed May 11 and reunited with her parents, who had come to Iran to seek her release, after an appeals court reduced her sentence to two years suspended.
The United States had said the charges against Saberi were baseless and repeatedly demanded her release.
The case against her had become an obstacle to Obama's attempts at dialogue with Iran.
Saberi had worked as a freelance journalist for several organisations, including National Public Radio and the British Broadcasting Corporation.
After her arrest, Iranian authorities initially accused her of working without press credentials, but later levelled the far more serious charge of spying.