YANGON, Myanmar —Voters elected opposition leader Aung San Suu Kyi to a seat in Parliament Sunday, according to her party, ushering in a new political era in the long-isolated Southeast Asian nation.

Hundreds of people cheered and shouted when a large screen outside the offices of her National League for Democracy party announced the victory. The party also claimed it had won at least 10 other seats of the 45 contested.

Despite Suu Kyi’s popularity in Myanmar, the victory, if confirmed, would put her in public office for the first time. She was under house arrest during previous general elections in 2010 and 1990.

While voting was peaceful Sunday, there were allegations of vote-tampering and harassment. The pro-military government hopes those are minor enough to convince Western nations that it’s time to end economic sanctions.

Analysts and activists welcomed the news of Suu Kyi’s victory but cautioned that it was only a first step.