Residents in the North Korean capital of Pyongyang were abruptly ordered indoors on Tuesday afternoon, multiple informed sources told NK News. One source described the cause as being due to a “nationwide lockdown” while another referred to an unspecified “national problem.”

The order sparked a rush to get home, said one of the sources, with long lines of people waiting at bus stops in the capital city Tuesday afternoon, while other residents could be seen hurrying home on foot.