Thousands marched through the sweaty, steamy streets of Philadelphia as the Democratic National Convention formally opened on Monday. Protesters—who ranged from disaffected Democrats to pro-pot activists, socialists, anti-war groups, a small contingent of communists and many of varying political stripes—took off in groups from City Hall for several long marches to the Wells Fargo Convention Center. With chants of “Bernie beats Trump” and “Hell no DNC, we won't vote for Hillary,” they swarmed both lanes of Broad Street, shutting it down for most of the day.

After what amounted to a four-mile march for many, dozens staged a sit-in at the gates of the convention, resulting in 54 citations for disorderly conduct but no booked arrests. In response to the crowd, which massed near the AT&T SEPTA station, police shut down southbound trains for several stops, leaving them open only to credentialed attendees of the DNC.

One noticeable difference Monday afternoon between the DNC in Philadelphia and the Republican National Convention in Cleveland last week was the absence of heavily armed, militarized police. Where small groups of demonstrators in Cleveland were often followed by squads of police on bikes wearing Mad-Max style body armor and all sides of public square were teeming with officers carrying pepper spray, tear gas and even automatic weapons, the Philadelphia police officers that followed the march were mostly clad in polo shirts.

“Everybody's keeping their cool in spite of the heat,” said perennial presidential candidate and activist performance artist Vermin Supreme, who often takes to the streets with demonstrators at national events that bring out large numbers of protesters “The police presence compared to Cleveland—I'm starting to wonder whether we ran out of cops or something.”