Myanmar authorities cordoned off part of the commercial capital of Yangon on Monday night while searching for student protesters, drawing international condemnation as crowds defied a curfew to resist the crackdown.

Embassies of the U.S., U.K., Canada, Germany and others sent tweets late on Monday warning that security forces had surrounded a group of young people in the Sanchaung neighborhood of Yangon. People in surrounding areas swarmed the streets as videos of the situation spread on social media.

By midnight, there were no reports of deaths from the standoff, the Associated Press reported. Security forces chased crowds, fired stun grenades and harassed residents watching from their windows, it said. Myanmar has regularly shut down the internet in the early-morning hours, making it difficult to get information.