Myanmar’s military seized power on Monday in a coup against the democratically elected government of Nobel laureate Aung San Suu Kyi, who was detained along with other leaders of her National League for Democracy (NLD) party in early morning raids, Reuters reported.

According to a statement on a military-owned television station, the army said it had carried out the detentions in response to “election fraud”, handing power to military chief Min Aung Hlaing and imposing a state of emergency for one year.

Reuters reported that phone lines to the capital Naypyitaw and the main commercial centre of Yangon were not reachable, and state TV went off air hours before parliament had been due to sit for the first time since the NLD’s landslide election win in November.

Soldiers took up positions at city hall in Yangon and mobile internet data and phone services in the NLD stronghold were disrupted, residents said. Internet connectivity also had fallen dramatically, monitoring service NetBlocks said.

Suu Kyi, Myanmar President Win Myint and other NLD leaders had been “taken” in the early hours of the morning, NLD spokesman Myo Nyunt told Reuters by phone.

“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 expected to be arrested himself. Reuters was subsequently unable to contact him.

The White House said President Joe Biden had been briefed on the arrest of Suu Kyi.

“The United States opposes any attempt to alter the outcome of recent elections or impede Myanmar’s democratic transition, and will take action against those responsible if these steps are not reversed,” spokeswoman Jen Psaki said in a statement.