Missouri Gov. Jay Nixon called for the National Guard to intervene in his city on Monday morning after protests grew violent yet again on Sunday night, despite a curfew the governor imposed on Saturday. (Sarah Parnass/The Washington Post)

Via Monday’s Washington Post, here’s what happened at protests in Ferguson, Mo., on Sunday night:

Earlier Sunday evening, police said protesters fired at least 30 gunshots and threw molotov cocktails at officers. Police blocked off Ferguson’s main avenue, and hundreds of officers in riot gear advanced on the crowd and began firing tear gas. Some of the demonstrators, covering their faces with scarves and napkins, tossed the tear gas canisters back at police, who included officers from the city of St. Louis, the county and the State Highway Patrol. Protesters began looting Papa John’s and Imo’s pizzerias.

The air was thick with smoke, and people could be heard shouting, “Hard to breathe!”

The Post has more on the protest here, and you can find a video of the scene above.

Crowds have gathered in the St. Louis suburb of Ferguson for days following the death of Michael Brown, a black teenager who was killed in a police-involved shooting earlier this month. Here’s what the demonstrations looked like overnight.

People protest Sunday for Michael Brown, who was killed by a police officer last Saturday. (Charlie Riedel/AP)

Demonstrators walk the streets of Ferguson protest. (Joe Raedle/Getty Images)

Police advance through a cloud of tear gas toward demonstrators. (Scott Olson/Getty Images)

Demonstrators hold up their hands as police fire tear gas. (Joe Raedle/Getty Images)

A police officer prepares to throw a tear gas canister as authorities try to disperse demonstrators. (Ed Zurga/EPA)

Demonstrators react as police fire tear gas Sunday. (Joe Raedle/Getty Images)

Protesters react to tear gas at the Michael Brown demonstration. (Lucas Jackson/Reuters)

Tear gas was fired at demonstrators in Ferguson on Sunday night. (Lucas Jackson/Reuters)

Tear gas and smoke drifts around the site of a protest Sunday. (Joshua Lott/Getty Images)