Underneath the giant Ukrainian flag unfurled over the crowd at the pro #Ukraine unity rally in Donetsk pic.twitter.com/yWQvBhX5Zy — Paul Sonne (@PaulSonne) April 17, 2014

Crowds are reportedly gathering in Donetsk in eastern Ukraine for a pro-Ukraine rally; estimates range from hundreds of people up to about 5,000. The action comes after Ukrainian forces clashed with pro-Russian separatists in the city of Mariupol, killing three militants and wounding 13. Ukraine is trying to restore order in the east, where officials say Russian special operatives are helping local separatists.

This appears to be a live stream of the rally:

Live streaming video by Ustream

Here are updates from some people who appear to be in Donetsk:

Petr Shelomovskiy identifies as a freelance photographer.

At pro Ukrainian meeting in #Donetsk now. Lots of police. Some riding horses. 2-3 thousand protesters. — Petr Shelomovskiy (@stopnarcotics) April 17, 2014

is the Moscow correspondent for the Wall Street Journal.

Lots of police encircling pro #Ukraine rally in Donetsk to protect protesters pic.twitter.com/3AZyf61em6 — Paul Sonne (@PaulSonne) April 17, 2014

Pro Ukrainian unity rally in Donetsk, probably about 1000 people. #Ukraine pic.twitter.com/Bn3dDLywvr — Paul Sonne (@PaulSonne) April 17, 2014

@Kateryna_Kruk identifies as being with the Euromaidan movement, the pro-Europe push that began demonstrating in Kiev in November.

works for Buzzfeed.