LONDON — Two octogenarian environmental activists attacked a glass case containing an original copy of the Magna Carta at the British Library on Friday, causing minor damage to the reinforced box but leaving the historic document unscathed.

The pair of protesters from Just Stop Oil, a group that has caused widespread disruption in Britain in its campaign to end to the world’s reliance on fossil fuels, pounded on the case with a hammer and chisel.

The Rev. Sue Parfitt, 82, and Judy Bruce, 85, a retired biology teacher, released a statement saying that they targeted the document to highlight the dangers of climate change.

“The Magna Carta is rightly revered, being of great importance to our history, to our freedoms and to our laws,” Parfitt said. ”But there will be no freedom, no lawfulness, no rights, if we allow climate breakdown to become the catastrophe that is now threatened.”

London’s Metropolitan Police said that two people were arrested.

The library’s security team intervened to prevent further damage to the case surrounding the Magna Carta, which is considered one of the founding documents of Western democracy.

The Treasures Gallery is temporarily closed until further notice, the library said.