WATCH | May Day protests in Portland, Oregon, turned ugly.
Tens of thousands of people marched peacefully on May Day to protest President Trump's immigration and labor policies.
While the majority of protests were harmless, with protesters chanting at the gates of the White House and many taking to the streets in Chicago, not all the demonstrations were violence-free.
Authorities shut down a protest in Portland, Oregon, that they said was becoming a riot when protesters began throwing smoke bombs and other items, ABC News reported. Other protests in Washington also turned violent.
In Seattle, five people were arrested, one for throwing a rock as supporters and opponents of Donald Trump squared up to each other.
In Olympia, Washington, protesters were ordered to disperse as they began throwing objects at officers and at other members of the public. Nine people were arrested.
To the south, four were arrested in Oakland, California, for creating a human chain that blocked access to a county building until county officials would cease cooperating with federal authorities.
Ironic how Portland Police will see no repercussions for violently attacking May Day protest simply because their union is so strong 😩— Gregory McKelvey (@GregoryMcKelvey) May 2, 2017
Naturally, the clashes sparked discussion on social media.