Myanmar leader Aung San Suu Kyi and other senior figures from the country’s ruling National League for Democracy were detained in an early morning raid on Monday, Reuters reported, quoting a spokesperson of the party.

NLD spokesperson Myo Nyunt told Reuters that Suu Kyi, President Win Myint and other leaders had been “taken” early in the morning. “I want to tell our people not to respond rashly and I want them to act according to the law,” he said, adding that he also expected to be detained.

The detentions came amid growing fears of a military coup in Myanmar. Ever since the National League for Democracy’s landslide win in November’s election, military leaders have discredited the results with unfounded claims of fraud.

Myanmar was under military rule till 2011, during which Suu Kyi spent many years under house arrest. The newly elected lower house of Parliament was due to convene for the first time on Monday, but the military had called for a postponement, according to BBC.

Phone lines to Naypyitaw, the capital of Myanmar, where Parliament was due to start, were not reachable in the early hours of Monday. Soldiers were on the streets in Yangon and Naypyitaw. Meanwhile, Myanmar state-run MRTV Television said on Facebook that it was unable to broadcast.

Suu Kyi, 75, had come to power in a landslide victory, winning 83% of available seats in the 8 November, 2015, election in what many saw as a referendum to her civilian government. This was the second election since the end of military rule in Myanmar in 2011.

But the country’s military has disputed the results from the beginning.

The military’s electoral proxy, the Union Solidarity and Development Party, has demanded a new election supervised by the military, filed nearly 200 complaints, and took the issue to the Supreme Court, according to Al Jazeera. Last week, the military’s commander-in-chief Senior General Min Aung Hlaing had threatened to abolish the country’s constitution.

Myanmar’s election commission has rejected the military’s allegations of vote fraud, saying there were no errors big enough to affect the credibility of the vote.