The Japanese government is urging citizens to “take shelter immediately” after North Korea launched an unidentified ballistic missile.

“ALERT: The Japanese government is warning that North Korea appears to have launched at least one ballistic missile,” the U.S. Embassy in Tokyo tweeted. “There’s a possibility it’s heading toward Japan. The government is urging everyone in the country to monitor news media.”

NHK World News, which reports on news inside Japan, said that the government was “urging everyone in the country to take shelter immediately.”