HARVARD, Mass. (AP) — Four climate activists who tried to block a train carrying coal to a New Hampshire power plant were arrested early Friday in Massachusetts.

The protesters were arrested in the town of Harvard just after 1 a.m. after erecting a scaffold over the tracks and refusing to come down, a state police spokesman said in a statement.

Harvard firefighters dismantled the scaffold.

Timothy Dechristopher, 38, of Pawtucket, R.I.; Adam Rice, 30, of South Portland, Maine; Cody Pajic, 21, of Pembroke; and Gia Neswald, 50, of Turners Falls, were charged with trespassing, walking or standing on railroad tracks, and obstruction of a passing train.

They were booked at the state police barracks in Leominster and transported to Clinton District Court for arraignment.

The group Climate Disobedience Center has held several protests recently trying to strop coal shipments to the power plant in Bow, N.H.

“With the climate crisis and the science as we know it is, it is far past time to be shipping coal to New England and burning it for our electricity,” said Jay O’Hara, a member of the Climate Disobedience Center.