Click on any image to launch slideshow. All photos by Alice Ollstein. Listen to her report on the demonstrations here.

The XL Dissent protest began at Georgetown University’s Red Square, the site where President Obama gave a speech about Keystone XL last summer.

Student activists fire up the crowd at Georgetown University.

Protesters block major DC streets marching from Georgetown to the White House.

Student activists sing “This Land is Your Land” at Keystone pipeline protest.

Students bring their message for President Obama to the White House.

Students bring their message for President Obama to the White House.

Cree activist Jasmine Thomas from British Columbia tells the crowd her people are preparing to block a tar sands pipeline with their bodies.

Kalamazoo, Michigan native Chris Wahmhoff holds up a chunk of chemicals and tar sands from a spill in his hometown river four years ago.

Students at XL Dissent say they got arrested out of love for the planet & future generations.

More than 400 activists were arrested Sunday.

Students chain themselves by one wrist to the White House fence.

Activists create a oil spill die-in on the White House sidewalk.

Protesters chant, “What do we want? Climate justice! When do we want it? Now!”

Some activists tied a hand to the White House gate, others took part in an oil spill die-in.

Student activists made up the bulk of those demonstrating in front of the White House against Keystone XL.