World News Roundup: 04/18

<p>The desperate fight for the Ukrainian port city of Mariupol.&nbsp;Fending off a Russian cyber attack.&nbsp;Searching for the gunman who attacked a Pittsburgh party.&nbsp;CBS News Correspondent Deborah Rodriguez has today's World News Roundup.</p><p>See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.</p>