(CNN) -- China executed 13 people Monday who were indicted on terrorism charges related to attacks on public places in Xinjiang province in recent months, according to China's Xinhua news agency.

They were among dozens arrested and publicly tried after a government crackdown on terrorism in the region.

Twenty-nine people were killed and 130 injured when men armed with long knives stormed a train station in Kunming in March. The next month, an attack on a train station in Urumqi, Xinjiang's capital, left three dead, including the attackers, and an attack on an Urumqi market in May killed at least 39.

Those executed are believed to be close to or part of China's Uyghur minority, a mainly Turkic-speaking Muslim population.