pActivists took refuge behind barricades in the eastern Ukrainian city of Sloviansk on Sunday April 13, as tensions remained high following two days of hostilities in the city. On April 12 armed and masked men raided the city’s police headquarters, while checkpoints were set up along the E40 highway to restrict access to and from the city. Ukrainian Interior Minister Arsen Avakov announced an a class="link" rel="nofollow" target="blank" href="" target="blank"anti-terrorist operationa early on April 13.