Men in black
Instead of the half a dozen local police officers and park rangers that had been called to assist them, there were now only two men, both dressed in black suits waiting for them to exit the building and jump off the roof. Both of them had a serious look on their faces.
They did not speak much but told them that they were with the government and that they needed to come with them right that instant. The police officers were confused and reluctant, but the men in black had been authorized by their chief of police to take them in for questioning.