WARNING-STORY CONTAINS GRAPHIC IMAGES<br/> <br />A deadly day in eastern Ukraine.<br/> <br />Amateur video appears to show crowds in Mariupol where several people have reportedly been killed.<br/> <br />Fighting there has been ongoing ahead of Sunday's referendum.<br/> <br />Reuters cannot independently verify the video, which was obtained from a social media website.<br/> <br />At the police headquarters, smoke rises from intense fighting between pro-Russian militants and Ukrainian forces.<br/> <br />Ukraine's interior minister said about 20 "terrorists" were killed.<br/> <br />Elsewhere, more amateur video showed an intense standoff between a Ukrainian tank and local residents.<br/> <br />One journalist said Ukrainian forces brought several armed vehicles into the city.<br/> <br />Mariupol is a major industrial and shipping center with a half a million residents.
