Ukraine on alert after gunmen seize buildings

Ukrainian troops and police officers are on high alert, after armed men seized government buildings in the Crimea region of the country and raised a Russian flag over a barricade.

Acting president Oleksander Turchinov told parliament on Thursday he had given an order for security structures to take "all measures" needed to protect citizens.

Al Jazeera's Robin Forestier-Walker reports from Simferepol in the Crimea region.