He’s the Secretary General of NATO, and he’s not the only one who’s concerned.

Early Thursday reports from the Crimea region of Ukraine described an attack on the parliament from a group of about 30 armed men who took control of the building. The Guardian reports:

The men occupying the parliament building in the regional capital, Simferopol, early on Thursday did not come out to voice any demands. They wore black and orange ribbons, a Russian symbol of the victory in World War II. The men also put up a sign saying “Crimea is Russia.”

They threw a flash grenade in response to a journalist’s questions. Phone calls to region’s legislature rang unanswered, and its website was down.

Crimea is a strategically important, beautiful peninsula located in the Black Sea at the southern tip of Ukraine. In recent days since the ouster of Viktor Yanukovych, pro-Russian and opposition groups have clashed over whether to split away from the pro-Western country.


Editor’s note: This post has been updated with additional tweets.