Thousands gathered Sunday on the National Mall in Washington to demand the federal government increase its commitment to disaster relief on hurricane-ravaged Puerto Rico.

Participants met in front of the U.S. Capitol in the morning before marching to the Lincoln Memorial, where speakers delivered remarks amid a sea of Puerto Rican flags.

Lin-Manuel Miranda, whose parents were both born in Puerto Rico, called on federal agencies to increase their aid and security to the more than 3.4 million Puerto Rico residents affected.

Puerto Rico, you are not forgotten, Miranda told the crowd. We can keep raising money, but its not gonna do any good if the government doesnt help us.